Answered on Jan 04th, 2011 at 8:28 AM
1. Yes he can sponsor you if he had previously been in jail for non child-support payments.
2. Yes he can still sponsor you if he had a drinking problem or have been convicted of domestic abuse.
3. His ability to sponsor depends on his income. I don't have that information here.
4. The household size should be 4 (him, 2 kids, and you).
I highly recommend that you hire an attorney to help you with the paperwork, if you are not sure about the answers that go onto the forms.