Hey man, I've been there (two failed startups). Whatever you learned during that time should be valuable assets/skills in many startups. Hang in there. You gotta be there for your family.
"Whatever you learned during that time should be valuable assets/skills in many startups"
I can not imagine for one moment failing in a business, taking a job at a startup, and having the owner(s) or others say "well... you've tried this before and failed - what's your input on XYZ?" In fact, I essentially went through this years ago, and could not find anyone who ever put any stock or value in my failures.
In one particular case it was very maddening because I watched the owners make several of the same mistakes I'd made just 2 years earlier, which ended up in me folding my company. Less than a year after I joined, they laid off half the workforce, then folded later. Try as I might to help in some way (not to take over, but to keep my job!), my previous experience of failure was not a valuable asset to that company.
Maybe it was just all the situations I was in aren't "the norm", but I just don't see it actually happening.