Tristan Thompson has been accused of not keeping up with all of his kids.

The Cleveland Cavaliers player recently made an appearance on The Kardashians, where Kim Kardashian praised him for being "such a good dad," but noted how he "just couldn't get it together in that area of being a faithful boyfriend" to ex Khloe Kardashian, with whom he shares daughter True, 5, and son Tatum, 14 months.

"Who he was was so f--ked up...but he's also shown so many decent things and has just been a really good person and friend," the SKIMS mogul shared in a confessional, pointing out how Tristan even helped babysit her four children during a difficult period in her life. "When he saw me struggling with my kids, he stepped up."

However, it seems her words didn't resonate with the aunt of Tristan's 6-year-old son Prince, who he shares with ex Jordan Craig. In an Oct. 5 Instagram post, Kai Craig accused Tristan of being an absentee father to his oldest child.

"It has been so hard to refrain from speaking up, and out of respect for my sister's privacy I haven't for over 7 years, but this is just too much," she wrote. "It's so painful to see how Tristan can find the time to do these nice things for others but can't seem to show up and be a real parent for my nephew Prince."

Calling his alleged absence "appalling and inexcusable," Kai continued in a message to Tristan, "You are NOT a good father if you can't be a good father to ALL of your children."

She added in a separate note to Kim, "I don't want to believe that you are this insensitive to the fact that he literally ignores his children. That's nice if he's been a good friend to you, but let's consider our sisters before taking to global platforms to defend this man's character."

E! News has reached out to Tristan, Jordan and Kim's reps for comment on Kai's claims but hasn't heard back.

Tristan began dating Jordan in 2014. He started his romance with Khloe two years later, while Jordan was pregnant with their first child. Prince was born in December 2016.

In addition to Prince and his two kids with Khloe, Tristan is also dad to Maralee Nichols' 22-month-old son Theo, whose paternity was revealed in January 2022 after the NBA star and the Keeping Up With the Kardashians alum sought a surrogate to carry their second child together.

At the time, Tristan apologized to Khloe for the "humiliation I have caused you."

"Khloe, you don't deserve this," he wrote in a statement on Instagram Stories. "You don't deserve the way I have treated you over the years. My actions certainly have not lined up with the way I view you. I have the utmost respect and love for you. Regardless of what you may think."

Since then, Khloe has accepted Tristan's apology, continuing to co-parent their kids together. "I forgive Tristan for me because I've got to let that s--t go," the Good American founder shared on a July episode of The Kardashians. "I need to for myself. I can't move on with my life if I'm holding onto this bulls--t."

To learn more about Tristan's kids, keep reading.

In December 2016, Tristan welcomed his first child. His ex, Jordan Craig, gave birth to a son, Prince Oliver Thompson.

Khloe Kardashian and Tristan's first child was born in April 2018 in Cleveland, when he was a player for the Cleveland Cavaliers. Khloe gave birth on the heels of an alleged cheating scandal surrounding the NBA star and a year and a half after the two went public with their relationship.

Over the next few years, Khloe and Tristan would weather more ups and downs in their relationship as they continued to co-parent True.

In December 2021, it was brought to light that Maralee Nichols had sued Tristan the previous June for pregnancy and birth expenses following a sexual encounter on his 30th birthday the previous March. She stated in her filing that she is pregnant with a baby boy and that Tristan is the father.

In his own filing, Tristan confirmed the two were intimate around the time in question and requested a paternity test. Maralee gave birth to the child, Theo, in December, and said in a statement to E! News that she had met the NBA star in 2020 and that he had told her "he was single and co-parenting."

In January 2022, Tristan announced on Instagram that "paternity test results reveal that I fathered a child with Maralee Nichols," and added, "Khloe, you don't deserve this. You don't deserve the heartache and humiliation I have caused you. You don't deserve the way I have treated you over the years. My actions certainly have not lined up with the way I view you."

In his statement, Tristan also said he looked forward to "amicably raising" his son with Maralee. In February 2022, her rep told E! News that the NBA star has not made any attempt" to meet the child. Tristan has not commented.

In December 2022, multiple outlets reported that the basketball player reached an agreement with Maralee, under which he will pay $9,500 per month in child support while she will have sole custody of Theo.

In August 2022, Tristan and Khloe Kardashian welcomed their second child together, a son.

A source close to the Good American founder told E! News that "the baby was conceived via surrogate before it was revealed to Khloe and the public that Tristan was having a baby with someone else in December [2021]."

In May 2023, it was revealed that the exes' son is named Tatum Thompson.

Tristan has often posted pics of his eldest kids on Instagram, although he has never shared a photo of Theo. The NBA star posted his first photo of both Prince and True in June 2018.

Keep scrolling for more pics Tristan has shared of his eldest two children.

"Let me love you a little more," Tristan captioned his October 2021 Instagram post, "before you are not so little anymore #MyEverything."

"Happy birthday Princey!!!" Tristan wrote. "I'm soo lucky to have you as a son papa. Your heart and soul is pure gold. Your sister is soo lucky to have a big brother like you to watch and protect her. Daddy Loves you baby boy."

On Father's Day 2021, Tristan shared this pic of himself with son Prince Thompson.

...and photo of himself with daughter True Thompson.

"Mommy and Tutu make me look good in these pics," Tristan wrote.

In July 2020, Tristan posted this pic of himself with his daughter, writing, "Daddy's Twin."

Tristan paid tribute to Khloe Kardashian on her 36th birthday in 2020 with this family photo. He wrote, "I'm wise enough now to know, you came into my life to show me just what it means to be an incredible person. I appreciate how I am able to learn from and grow because of you. I thank God for the beautiful and loving woman you are to everyone, especially our daughter True. You deserve the world Koko! True and I love you mama. Happy Birthday @khloekardashian."

"Happy Birthday to my sweet baby True," Tristan wrote in April 2020. "You have no idea how much daddy loves you. I can't believe how fast time has flown by. You will always be daddy's little girl. I Love you soo much Tutu. Happy birthday day. #DaddysTwin"

"Happy birthday to my baby boy Prince," Tristan wrote in December 2019. "You're already 3, I remember holding you when you were born and telling you how amazing of a baby you are. Everyday you continue to surprise me with your development, your love and your big heart. Your smile is one that lights up every room you are in. I thank God everyday for picking me to be your father. May God continue to bless you each and everyday son. I love you."

Tristan posted this pic, writing, "We had the best time at Cali's Birthday party!!"

On Prince's second birthday in December 2018, Tristan shared pics of the boy and wrote, "Happy birthday to my son Prince, so blessed the man upstairs chose me to be your pops. You're my motivation everyday. Daddy loves you so much!!! #MyTwin"

Tristan shared this video of himself cuddling his daughter at her first birthday party. "My princess," he wrote. "I love you soo much."

On True's first birthday in April 2019, Tristan posted pics of his daughter, including this throwback pic of them doing skin-to-skin in the hospital after she was born.

Tristan wrote on True's birthday, "True-ly Perfect...My baby girl is one today. Man time goes by soo fast but i'm loving every minute of it. Can't wait for us to sit home all day and watch lion king and paw patrol lol. #MyTwin"

Prince Thompson bonds with baby sister True Thompson.

Tristan shared this selfie with son Prince in July 2022.

Tristan shared this pic of son Prince on a basketball court in August 2022.

Tristan cheers on son Prince at basketball practice.