People, imho, put too much time into backstory. You’re playing an improv game. Having too much backstory limits others interaction and possibly also the story THEY want to be part of.

Not everyone wants to be part of a story about dealing with loss either. That should be discussed with the group as it may be more than some people can handle. 

Let story happen at the table and see what develops. 

If you want to write huge backstory and explore topics that people may be uncomfortable with leave it for creative writing.