Actually mate I was a stay at home Dad because it's what most benefited my then family and it costs nothing to take your kids to the park, kick about with a ball or spend time colouring in. And when I do have them now (Prior to boxing day, the last time I saw them cause of the ex) I always put their needs ahead of my own and love making memories like reading them bed time stories and helping my lad practice his writing and numbers and stuff or teaching them how to do rolly polly's down grass hills and hear them giggling away.. You don't need a lot of money to be great parent!
And as far as my mental capacity goes, yes I have a serious mental health condition but that doesn't make me me any less intelligent than anyone else, its hardly learning difficulties. Are you the type of person who looks down your nose at people with learning difficulties?