The NBA star is also dad to 5-year-old son Prince with ex Jordan Craig and 8-month-old son Theo with Maralee Nichols.
Khloe, 38, and Tristian, 31, have long been vocal about their wish to make True a big sister, despite their on-again-off-again relationship. On a 2020 episode of Keeping Up With the Kardashians, the pair were filmed making baby plans, even though they were separated at the time.
“I might get some embryos and get a sibling,” Khloe told Tristan. “I might need to borrow some sperm or get some from you, but we’ll figure that out later.”