This is probably less complicated than I'm thinking it is, but here we go....
FBIL has been living with (and is now apparently married to, but that's a whole other story) his new love for sometime. He is in the wedding and she is of course invited as she is now his wife. Here lies the problem, how to address the invite....to include HIS two children but not HER three children. We are strictly having nieces & nephews the only children; if I could get away with have absolutely no children, I'd prefer that but with FI having 9 nieces & nephews, I'm not even trying to fight that battle.
Thanks for any input!