Oh hey Jolie I forgot you were over here too LOL
Yeah you can have your mom or someone else cosign..
Since you said he had a visa at one point that expired, that makes the process easier and he doesn't have to leave the country.. (assuming he has NEVER left and came back since it expired)

www.immigrate2us.net is the best that is all I can tell you ..!
First step is the I-129f
www.visajourney.com is also a great resource..

Good luck!