Don't make things worse by exposing them. If you do, it only becomes harder between them and for you. But try to understand them. If it becomes to much, tell them that you know about their partners and tell them you don't want a broken family
Isn’t it funny that; A tik tok girl in my year, whose stuck up, selfish self centred and all worlds like that, only talks about air up and tik tok, who faked “not being striaght” acutally had her dad in a coma!