Do I tell my family that I like women?

Hello. I am 16 year old girl and I have two family problems.

My grandma on my mom’s side is a Christian and there is nothing wrong with that but she does think that being gay or lesbian or trans or anything in LGBTQIA+ is a mental disease and should get help. I don’t know if I would call her an extreme Christian but she hates LGBTQIA+, goes to church every Sunday, does Christian fasting, prays every morning and night, etc etc. I love my grandma with all my heart but it pains me to know that I can like be honest with her because I’m scared she will hate me if I tell her the truth. Should I tell her and hope she won’t hate me?

And secondly, my father. He is an ass and he is also a gaslighting, cheating bastard. I know he isn’t too keen on LGBTQIA+ people since around 8-7 years back my older brother who was around nine or ten years old at the time, made a joke about being gay and my dad yelled at him and slapped him twice.

I hate my dad but soon during the summer i will have to visit him (my parents are divorced and I live in Germany with my mom while he lives in another country). He is not a good dad but if I want to visit my cousin and my grandma on my dad’s side, I will have to see him since he lives with my grandma. So I don’t know if I should spite him and tell him that I like women and that he can eat his loser ass?

(Sorry if i wrote too much. I was too lazy to make two posts so I just squeezed everything in one. If you have questions then ask in comments and I’ll try to answer.)