Celebrity Celebrity Family Celebrity Pregnancy Tristan Thompson Is Expecting a Baby with Texas Personal Trainer in December Tristan Thompson is already dad to daughter True, 3, with Khloé Kardashian, as well as son Prince, 4, whom he shares with ex-girlfriend Jordan Craig By Georgia Slater Georgia Slater Georgia Slater is a staff editor on the Parents team at PEOPLE. She has been working at PEOPLE since 2018. Her work has previously appeared in USA Today and Washington Life Magazine. People Editorial Guidelines and Abigail Adams Abigail Adams Abigail Adams is a Human Interest Writer and Reporter for PEOPLE. She has been working in journalism for seven years. People Editorial Guidelines Published on December 6, 2021 11:08AM EST Tristan Thompson will soon be the father of three. The NBA star, 30, will become the father of a baby boy with Texas personal trainer Maralee Nichols this month, according to court documents obtained by PEOPLE. The documents show that Nichols is suing Thompson for child support and other pregnancy-related fees. The Sacramento Kings player admitted to having sex with the personal trainer on at least one occasion, per the docket. Thompson ordered "genetic testing" in July before amending his petition in a Texas court last month, according to the court documents. Thompson's rep did not respond to PEOPLE's request for comment prior to publication. For more on Tristan Thompson's baby news and paternity suit, and other top stories, listen below to our daily podcast on PEOPLE Every Day. Thompson is already dad to daughter True, 3, whom he shares with Khloé Kardashian, plus son Prince, 4, whom he shares with ex-girlfriend Jordan Craig. Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories. Khloe Kardashian and Tristan Thompson. Rodin Eckenroth/WireImage; George Pimentel/Getty Tristan Thompson Shares Sweet Photos of His Kids True, 3, and Prince, 4, Together: 'My Everything' A source tells PEOPLE that Kardashian, 37, and Thompson were "together in March" and "knows about the baby, but hasn't known for long." Thompson and Kardashian have been on and off for several years, and most recently split in June. A source previously told PEOPLE that the exes are continuing to "keep things friendly" for True's sake. Tristan Thompson. Abbie Parr/Getty In October, the Sacramento Kings player shared rare photos of his two children hanging out together at an arcade. The first snap shows the siblings standing side-by-side with big smiles while another shows True looking fondly at her big brother. True and Prince Thompson. Tristan Thompson Instagram; Rocky Widner/NBAE via Getty Images "Let me love you a little more, before you are not so little anymore #MyEverything❤️❤️," Thompson captioned the sweet Instagram post. Kardashian commented on the photo, writing, "They are so beautiful and sweet!!!! So so blessed!!! What angels! ❤️." The NBA player typically shares snaps while spending time with his kids individually. Thompson previously gave fans a glimpse of his kids together back in 2018 after True was born, posting a family portrait on Instagram for the first time. This story was first reported by The Daily Mail.