Sagittarius, Jupiter, Neptune, Pisces family - Discussions, questions

I could use some help with a pattern which is starting to emerge for me in my family. I have Jupiter at the edge of Cancer and at the end of my 1st house? So my Neptune is like exactly conjunct my parents´ moons in Sagittarius, my brother´s Sun. I have Mars in Pisces and this same Neptune squaring it.

Also my personal Pisces planets are in Pisces, ruler of Neptune? (I don´t get these rulerships, if a planet rules a sign or vice versa, both ways, whatever, it doesn´t make real sense to me yet.)

But I wonder what is that Jupiter doing in our family too? Substance abuse I can derive from Neptune / Pisces (strangely I have tried many things but never had any addictions). But what is Jupiter signifying in our family?

Also a strange pattern is that first borns are Cancer rising maybe except my dad who is Leo Sun but I think in 12th house as my mom, Gemini Sun but Cancer rising. The reason I say this is because I really had a very troubled life with my parents unfortunately. We loved music, art and travel. That is what has bound us together.

My kids have earth moons. My brother´s moon is opposite mine. He is Leo rising as he is 2nd born like my 2nd born daughter.

Wondering what that Neptune of mine had to do exactly conjuncting my parents moons? Squaring my Mars... And my dad had probably Mars in 1st while I have Jupiter there, or at the end? sometimes.

Problems with narcissism. They were like kids and we the parents. At least many times I had that strange feeling.