You shouldn't be jealous of your child's partner.
Claire has a son that has a girlfriend.
Claire wants to talk to her son and his girlfriend about their relationship.
Claire tells the girlfriend that she supports her son well.
Claire tells the girlfriend that she's taking up all of her son's time that he could be spending with his mother.
The girlfriend is happy that Claire thinks well of her.
The girlfriend will feel awkward and not want to date the son anymore.