My Sister passed away this morning

Sorry to hear about your sister.

I haven't lost any of my brothers yet, but I've lost all my grand parents, parents, aunts, uncles, a sister in law, and a 21 year old nephew to suicide. In all, about 13 people in the last 15 years.

After my mom, and my last uncle died, I really started freaking out for a while. Like ok, now me and my bro's are the oldest members of the family. I walked around for 6 months thinking I was going to drop dead, like, its my turn now.
Took a while to get over it, but it is weird becoming the old folks in the family, with no one older to look up to or ask advice from.

I wish you the all the best.