I'm so sorry you're dealing with this. I've dealt with similar issues with my sister for a long time. We're identical twins and just turned 35 but most of the time she acts like a super immature kid. If I get attention for anything she'll try to 'one up' me, or gain sympathy from my suffering...and it's so sad to me that the feels like life is a competition like that and that it's appropriate to try to get attention for other people's suffering.

One of the worst examples is: my best friend in the world died suddenly when we were 26. I was completely devastated. She'd only met him a couple of times and he hated her, but she went around telling everyone she knew and on social media ect that her best friend had died and she was crushed...she went so far as to fly from Arizona to NC to attend his funeral. Also when I got my BP diagnosis I asked her not to tell people because it's no ones business and she's been going around telling people her sister is mentally ill and she's so distraught ect. So I completely understand what you're dealing with.

I'm so sorry you're dealing with this. I wish I could say your sister will change, but unfortunately she probably won't. In my experience the best you can do is try to ignore her behavior, which I know is much easier said than done. Especially when're going through your own stuff. Hugs.