Support groups for siblings with serious mental illness?

Hi friends —

I did a search on this subreddit and the internet before posting this question, but I am sorry if I’ve missed this similar topic along the way prior to posting.

I’m wondering if anyone has any experience with or knows of any support groups in the area for siblings with serious mental illness (SMI), and could speak to those groups’ environments and general atmospheres. I know NAMI has a family support group and a sibling support group, and I’m considering signing up for both. I haven’t attended support groups before, and I’ve noticed throughout the last week the toll that my sister’s health is starting to take on me. (I feel really bad and embarrassed to say this out loud.) I thought that maybe the support group route could be a way of finding a community of people with a similar experience.

Thank you so much for any insight or ideas — I really appreciate it.