Looks to me like both are more opportunistic than villainous at this point. It seems like they currently don't go out of their way to create trouble for Ram/Priya, but they don't really look out for them either.
Nandini got me doubtful by the way she interacts with the rest of the family. She strikes me as someone who is very clear about where everyone stands. She does not harbor any delusions. She knows Ram is the one who runs the business and takes care of the house. Given the right motivation(family ka pyar), he will do anything for them.
Had she been a concerned family member, she would be worried and angry on Ram's behalf, something like the way Priya's mom or Vrinda behave. She seems to know the whole Vedu story, but does not dwleve on it much. Maybe she doesn't really want him to move on? Imagine if Ram did marry Vedu- where would this family stand in issues of Vedu vs them?
Nandini admonishing Shubam or Shivi, was more "don't be nasty, don't give Ram reasons to dislike us or grow distant from us, we need him" as opposed to "Ram is a true gem of a person and your attitude and words will hurt him"
Maitri is one some other plane of existence 🤪 I think they are going for a "bimbo" characterization for her. She doesn't seem to care for anything other than material comforts. It doesn't matter what else is happening in the background. If you notice the scene where Neeraj just ignores her- she easily forgets and bounces about happily when she gets distracted with news about PriRa(was this the ship name?). She doesn't get overly hurt or doesn't think too much about Neeraj being detached.
I wonder if that is a mutual understanding in their marriage- she knows that Neeraj does not love her, but she is good as long as he provides the big home and the fancy vacations that she can flaunt at the world. He just wants a trophy wife, with the added bonus of being Priya's sister, so that he can rub it in for Priya, every chance he gets.
This is an Ekta Kappor drama- so most probably they are leaving the door open for either of these characters to become evil as needed. But they will probably change back as easily 😆