My DD is 14, there is 5 years between her and her oldest cousins however she has lots of cousins and also DExP DD who is 1.
For years my DD (13) has always had extreme jealousy when it comes to her cousins on both mine and her DF side. If family members are giving attention to other cousins she gets upset/annoyed/moody. DD is looked after by my mother when I am at work however she refused to go the last few weeks as my mother has been looking after my niece over the summer holidays. I have also noticed when adults of the family make any comment or tell any of the others off she seems to get a kick out of it.
It doesn’t help that being first born she previously had a bedroom in both grandparents house but as you can imagine with growing families this is not possible but she has made comments before that “so she should” as she was the first born. I’ve never ever pushed this narrative but now any talk about changing those rooms and she hits the roof. I also don’t think this is fair on cousins as it looks like favouritism.
I thought she would grow out of it but she’s now 14 and the jealously isn’t going anywhere. If anything it’s worse the older she gets as she’s plain nasty sometimes to the kids. She also has a new sibling which she is also insanely jealous of.
Has anyone experienced anything similar? I have tried my best to sit down with her and try to teach her the best approach and that even with new members in the family it doesn’t mean she’s any less loved. Nothing I’ve said or done over the last however many years seems to have made any difference.