Ex doesn't like that partner is trans, may start custody battle
My (cisF) partner very recently chose to begin transition (m to f). We've been slowly sharing with folks - we started with a group of people we knew would be loving and supportive, and now we're sharing with the folks who we know may not take it well. For the most part we're both ready to accept the outcomes of most of these conversations (ie, if we tell someone and they don't like it, that's a them problem, not an us problem, and if that means the end of that relationship, so be it).
There is one exception - my ex spouse is my child's father. When we were together, he was more open minded, but since our split he's leaned further right. We share completely equal 50/50 custody. We set our custody agreement ourselves and did not have any custody battle when we divorced. We agreed that we both wanted to be part of our kid's life. We live in Texas.
Today I told my kid's father that my partner would be transitioning. He was upset and shocked. We talked a bit and he left calmly, but clearly frazzled, and said he had to think about it.
I'm afraid of what comes next. We've never had a custody battle. My son's entire life he's had both of us. He is 12 now.
Has any one else gone through anything like this? I've found two cases of trans biological parents losing custody of their kids in Texas. I can't find anything regarding trans step parents.
I know my ex may just be in shock. I just fear what could come next, and I need resources to understand what could unfold.