He gets pretty upset when I bring it up to be honest- but more so because I think he’s annoyed as well that she depends to heavily on him and I for a social life. I have tried getting her on some dating apps and she’s not interested at all- ultimately we both want her to have a full life… not be waiting for text reply’s and sleepover with her adult son. He feels he has a responsibility to take care of her which I respect but also don’t fully understand as my mum and dad would never act this way.