I'm really struggling with DM's favouritism of DSis at the moment.
It doesn't seem to matter what I do or how hard I try to make DM proud, DSis will always be better despite - not to brag but I have objectively achieved far more in life. If DSis recommends something for example, then it's absolutely the best of the best in DM's eyes and her talking point for the week. If I recommend something it's instantly dismissed. Basically anything DSis touches turns to gold. It even goes so far as my in laws just as an example. If I bring up my nieces and nephews in conversation, DM will change the subject but go so far as to go around showing pictures of DSis's nieces and nephews. DM has never met either of these in laws and my in laws are lovely. I could get 8 different compliments on an outfit at work yet DM will say she doesn't like it. Any time I see DM and DSis together DM compliments something she's wearing no matter how simple it might be. I honestly think I could win a Nobel prize and DM would barely raise an eyebrow whilst gushing over something simple such as where DSis last ate at a restaurant. DSis doesn't seem to actively encourage any of this by the way.
If I brought it up with her I would be told I am over sensitive or that it's all in my head and DF would back her up as that's what's happened with past experience of ever broaching anything with DPs.
Does anyone else have a similar family set up and how do they deal with it? It's really affecting my mental health lately.