Tristan Thompson is facing some heat for referring to ex-girlfriend Khloe Kardashian's niece Dream as his "oldest daughter" ... especially from the little one's mama, Blac Chyna.
ICYMI ... the NBA player caught some flak on social media after he filmed himself sending love to his "2 daughters," Dream Kardashian and True Thompson.
SHOUTOUT TO MY BABIES
Many online felt it was inappropriate of Tristan to claim Rob Kardashian's daughter as his own, especially since he isn't blood-related to the 8-year-old, and is NOT dating Dream's aunt.