Saying a prayer for you.
You are in a difficult spot. However, this is not your responsibility.
While I have myself had cordial relationships with some transgenders, I would never want to expose my family members to the confusion this behavior brings.
In other words, my biggest piece of advice is to not allow any children in your care to have contact with these family members. This could force you to openly share your convictions with the whole family, with the strong possibility of being ostracized.
Lot’s of land mines here. There is no one-size-fits-all advice. But you are going to the right place when you have decided to take it to God. Keep doing that.
Agreed, mine are older and want nothing to do with it. They are just very sad for their cousins. I think I’m going to send him the article mentioned above in this thread.
He wants to hear nothing from my mouth, but an expert third-party reference may wake him up. That’s the best that I can offer. That and prayer.