Kwaapia

I was over 18yrs when the marriage happen.

Hello Everyone, I intend filling a petition for my biological mother, however my mother is current married to another man, my question is can my mother's husband immigrate with her when the petition is approved and visa become available to her. I have read about derivative option online and my understanding is, a spouse or children of I-130 beneficiary can accompany or follow to Join the applicant. Will that be the case for my mother and the current husband? how do I go about it to bring her and the husband together? Please help. Thank you in advance.