If they invite you at all, that equates to you having already failed.
If the kids do not know to stay away, it's because you are not staying away which implies acceptance or compromise. So you need to disown the queers completely and you explain it to the kids in terms they understand - i.e. "we do not go by them" - kids do not need much more explanation, too much explanation can be scandalous to kids.
The queers should know well why you've disowned them, there should be zero doubt in their minds about why you've disowned them and that it would take their conversion, their coming back to the true faith before you will have anything to do with them.
I am guessing that most trads have lost close family members because of persevering in the faith, that's the way it goes. When that happens, it is their fault, not yours.