can marriage save him from deportation?

Terisito M asked:

My boyfriend has an expired visa. It’s been expired for 5 years now. His mom didn’t renew his visa and didn’t work his papers that’s why he is having a lot of trouble. We don’t want him deported. And we want that his status would be legal. Would marrying him give him a green card? Coz my grandparents said that marriage cannot change a visa’s status anymore.

HELP!