Mopsey, I think your "C" is on the right track, i.e., meeting w/each of you separately for now.
As for the bills, he may be using the excuse that the job isn't working out so that you don't expect him to help w/the bills. I wouldn't feel too sorry for him in this respect. He is still an adult and he still has responsibilities. It may come down to you filing for support at some point. Do not feel badly about that. You need assistance with your family and he is after all their father.
Oh, the man will use any excuse not to come into the house. Now, it's your father. He knows that he's done you and the family wrong and he knows that your father will call him on it. Don't worry about it too much. Tomorrow, he will find another excuse not to be around you.
As for the anger, it will die down eventually, especially if you don't react to his behavior.
Mopsey, please congratulate your son on his gold medal. This is great. I'm only sorry that his father wasn't there to share in the activities.
Hang in there. I am hoping that your situation settles down very soon.
