^ A guy who lets his significant other's family disrespect him and then when the girl disrespects his family (his mom, of all people) - there's really no hope for such a relationship and it makes me question the guy's own self respect and his respect for his own family.
It seems like as a family, the girl's and her siblings' upbringing is lacking in some way if they think that it's okay to speak poorly or mistreat others and then later (maybe) say sorry. He should run far, far, faaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaar away. Because either she will cut him off from his family or she and her family will make it a source of conflict for their entire relationship.
The girl isn't taking a stand with the guy, she's taking a stand with the family. She's out right cursing the guy's mom. But later apologized for that. But the guy now feels conflicted if she'll ever take his stand. If she lets her teenage siblings disrespect him without scolding them or telling the sister to apologize later not sure how the guy feels now. The guy thinks she'll do it later too.
In that case, think of her as a churail and.......RUNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN!!!!!!
The girl isn't taking a stand with the guy, she's taking a stand with the family. She's out right cursing the guy's mom. But later apologized for that. But the guy now feels conflicted if she'll ever take his stand. If she lets her teenage siblings disrespect him without scolding them or telling the sister to apologize later not sure how the guy feels now. The guy thinks she'll do it later too.
If she's cursing your mom, then you have bigger problems than just her not taking a stand for you. If this is how she behaves during conflicts, then what guarantee do you have that she won't curse your family again? If you're contemplating marriage with her, then ask yourself if you think she makes a good garment? Spouses are supposed to be a garment or libaas for one another, they're supposed to protect each other's izzat and image among other things...not humiliate each other in front of family. Maybe she doesn't tell her siblings to stop mistreating you because she knows that they won't listen to her or that they'd turn against her too. But then again, her own behavior (the cursing) is worrying too. Think about whether or not this girl has the qualities that would make her a good wife/mother in the long term. After apologizing for her mistakes, does she make the effort not to repeat them again or do you see her making the same mistakes over and over again? Do you see her losing control of her temper over and over again? Do you see her being influenced by her family over and over again to the point that she acts on their influence? If she repeats the same mistakes, then ask yourself if you have the energy to continue put up with this behavior? If you're still undecided, then do istikhara. If she's right for you, Allah will make it easier and if she's not right for you, He'll bring it to an end.