"Ring theory"[0] was one of the most important things anyone shared with me when my sister died.
Tl;dr: Whoever was the closest to the deceased is in the innermost ring, perhaps a spouse, a parent, close siblings (in my case, my sister's husband).
The next ring is the people next-closest, in this case, my mom.
The next ring includes the next-closest people, like me, my brother, my dad, etc. And the rings keep going outward.
Here's the rule: You can dump absolutely any pain, need, or struggle you have on anyone who's in a farther/larger ring than you are. UNDER NO CIRCUMSTANCE are you allowed to dump anything on anyone in a closer ring. Support works one way in the ring. The outer layers support the inner ones. ONLY.
Very early on, I relayed this to one of my sister and brother-in-law's friends and asked him to make sure anybody who wanted to connect with us understood. He did it masterfully, and I recommend tucking this theory in the back of your mind somewhere for when you need it.
[0] https://www.everhomehealthcare.com/post/ring-theory-and-sayi...