My Daughter is transitioning and I just found out her Uncle voted for Trump

I am heartbroken at my brother's reason for voting for Trump in 2024, especially knowing he was aware his niece is transitioning. He found it impossible to vote for Kamala Harris because of her support in 2016 of federal funding for gender re-assignment surgery for federal inmates. I don't know how to address this or anything with him currently. Can anyone offer any helpful advice?