The kittens learn so much from their uncle! From their point of view he’s HUGE and strong and amazing. In reality he’s only a year older than they are, and extremely energetic, so he’s just like a bit kitten himself. He certainly is willing to play as long as they want.
Tex will bowl the kittens over when he’s experiencing uncontrollable zoomies, but he has never hurt them. He’s always careful when he plays with them, and will usually give up a toy if a kitten wants it.