@thagyrlIam,
I don't think you are really even thinking this through.
You've been married before, it didn't work.
Your son's Father has re-entered your life having been in prison for 10 years, has a part time job at this stage and more than likely is finding life quite difficult to what he's just had to deal with for a decade.
You've been together for only 5 months and "he's good with the kids" so that will do, marry him. My question is why? So you can get Divorced again?
No where did you state you love him. Rather, you want to get married to him because he's living with you and to you that's a Sin.
So is stealing, attempted murder, robbery.
Your "children" need a Father figure that is going to be around all of their life.
I just have this gut feeling that this has nothing to do with love at all, rather settling.