Tristan Thompson Slammed by First Son's Aunt, Says He's a Bad Father

Tristan Thompson may be getting praise from the Kardashian family for being a good dad, but it's certainly not that way across the board ... as he's now getting slammed by the aunt of his first son.

Tristan has a 6-year-old son named Prince with Jordan Craig ... and Jordan's sister, Kai, just unleashed on the former NBA star. Kai says it's disgusting Tristan can't show up and be a "real parent" for Prince yet he can do a bunch of nice things for the two kids he has with Khloe Kardashian.

Kai continues, "The fact that he can take other children to school and activities in the same city, yet never sees or speaks to his own son, unless it's for a party or planned photo opportunity, is appalling and inexcusable."

She then turns her focus to Kim, who on a recent episode of "The Kardashians" said Tristan was, "such a good friend and such a good dad."

Kai says 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."

Kai also claims Tristan has not paid for Prince's tuition or child support in a "very long time."