What should I do? Family conflict and personal turmoil

@IndigoBro Wow you hit the nail on the head with reading the situation and how I feel towards G and how C is a challenging person to confront. Also I'm happy that it wasn't to too confusing with the letters lol I do have a hard time with wanting to teach my siblings, G is 7 years older than me and C is 5 and they both have either denied, avoided or tried to spiritually heal their undiagnosed mental disorders. I have Bipolar 2 disorder and C and G have been depressed multiple times in their lives and act like everything is fine after they feel healthy again. They both can be passive aggressive and it is hard when my nieces and nephews are involved because I don't want to miss out on their lives because my sisters and I can't get along. And then problem is that G is so aggressive about not taking any advice from me or anyone that isn't married or don't have kids. I have been a professional nanny for 10 years and I do research about children's development a lot because I'm considering being a child psychologist, but she doesn't respect any of that. The hardest part is that she has given me so much advice over the years and it has been shit most of the time. I told her I'm am going to take a break and she left me a nasty voice message after our phone call and so we are mutually agreeing on not talking for a while. We both said we loved each other though so it isn't a forever thing. I am just tired of waiting for her to learn life skills, boundaries, healthy confrontation, being confortable in social situations and not blaming everyone for her lack of relationship skills. I'm not exempt from that list of things to learn but I hate knowing more things than someone and them choosing to charge ahead in ignorance. I think I need to be more introspective in this situation because she shouldn't make me this mad. Do you have siblings?