Husband's mother :- Mother-in-law Husband's father:- Father-in-law Husband's sister:- Sister-in-law . . . Then Husband's boyfriend ? Simple ! Boyfriend-in-law, isn't it? Do you want to know about me and my boyfriend-in-law? Hello guys it's me with my 1st oneshot (MewGulf) Don't forget to check it out sweethearts. *M-Preg*