Am a us citizen I married my husband for 2 years and been together for 7 years we have 3 kids together he entered the us when he was 16 years old but he entered not legal but people say that he need more papers from Mexico he only has his birth certificate he doesn't have an I'd what other papers does he needs and how long does it take to fix his papers

There is no promise he can ever fix his papers, He needs a immigration attorney, plus he may even have to move back before he can get permission to come back to the US