I echo couldbecousin. I haven't walked in your shoes so my advice would be superficial. but you have my thoughts and prayers.
My great grandfather on my mom's side committted suicide (gun) in the 1900 decade. While I don't know the details or even the broad picture of their lives I suspect it affected the family greatly. He left 7 children and a wife in poverty. Perhaps he was depressed that he couldn't care for them adequately. I don't know.
I have seen first hand the effect that a parent's death leaves on a child. My mom's dad was murdered when she was 3. I don't think she ever recovered from that, nor did her mother. I am trying to break the inherited cycle of loss with my own family.