I can see that you need the break from the kids, and maybe giving your ex some gas $ is how to get it. But his wife's income is none of your business. It just isn't, and it is not part of thee calculations for child support. He is broke because spent all the money he had. Your kids are clearly not his priority. He also KNOWS he can get $$ from you, so why would he spend his own money?
in my opinion it would be vastly better for you to keep the kids at home and document his refusal to pick them up because he doesn't have gas money. Get a journal and start documenting every single thing he does/says. He periodically threatens to take custody from you, and he also isn't paying his support regularly. These would count against him, but if you don't document this and keep the documentation organized, then it is as though none of it ever happened. See if you can get him to communicate with you by email when it comes to stuff about the kids. That would let you print off the emails and keep them in a file - and it would be HIS words as proof.
As far as support, I would make SURE that his employer knows that if the support isn't paid then the employer can be held accountable - not just the parent. The employer may be sending partial support because of some sob story that your ex is giving him. I bet that the sob story wouldn't work if the employer knew that the unpaid amount could come out of his pocket rather than your ex's pocket.
in my opinion it would be vastly better for you to keep the kids at home and document his refusal to pick them up because he doesn't have gas money. Get a journal and start documenting every single thing he does/says. He periodically threatens to take custody from you, and he also isn't paying his support regularly. These would count against him, but if you don't document this and keep the documentation organized, then it is as though none of it ever happened. See if you can get him to communicate with you by email when it comes to stuff about the kids. That would let you print off the emails and keep them in a file - and it would be HIS words as proof.
As far as support, I would make SURE that his employer knows that if the support isn't paid then the employer can be held accountable - not just the parent. The employer may be sending partial support because of some sob story that your ex is giving him. I bet that the sob story wouldn't work if the employer knew that the unpaid amount could come out of his pocket rather than your ex's pocket.