Just saw a similar thread on here so thought I would share my own experience to gauge people's thoughts.
My adult children (all over 30) dislike my partner, though they have never told me this, it is clear. I've been with my partner 4 years (single before that for many, many years and divorced their mother when they were children under 10).
I think the reason they dislike her is because of the position she has ended up in. She was a carer for her daughter so has never been able to work, own a house, or have savings (she actually has debts). Her daughter has now become independent in a relationship and moved in with her boyfriend so my partner has lost all her benefits and has become financially dependent on me. I think my kids look down on her for this reason.
They make no effort with her, never ask me how she is, and occasionally don't invite her to events. I always feel like I have to ask if she can come. My partner's self-esteem is rock bottom and she feels like she isn't good enough. She feels like they are civil to her and reasonably polite but she doesn't feel liked or approved of.
I just feel so stressed with it all, the fact that it's clear they don't like her and I find it so rude when they don't invite her to things like meals. I have asked them outright and they say it's not that they don't like her, it's that they don't know her as when she attends events she doesn't speak. Her shyness is as a result of feeling not liked. They also said it works both ways - that I have organised events with her and her family at my house but not invited them. Now that she is likely going to be moving in with me permanently and losing her house I just wonder if this issue between them can ever be rectified?