My father, who convinced me (16 m) at the time to move in with him instead of my mother when they moved. All 3 of the other siblings stayed with my mother. He then kicked me out the week I turned 18, a week into my senior year. Since then he stays in touch only to speak with his grandchildren (now going on 4 kids). I have never been anything but opportunistic and positive in our interactions. Regardless he still acts like I am a burden to talk too. Am now 37, and finally getting to the point I should accept it. I'm the complete opposite with my own children and can't comprehend how someone could treat their child like this. How do I cope? It eats at me. I will answer any questions in depth if it will help in understanding the situation.
That's the neat thing, you don't.
You deserve to speak your mind. The idea you must endure abuse from even those who created you is false. Don't ask "how do I cope", ask "how do I assert". There is a difference between rightful treatment from those you owe yourself to versus treatment from those people which run counterintuitive to being able to claim parenthood as justification.
What's going to happen if your children one day ask why he treats you this way? Is this good for them?