1) Father figure 2) Father surrogate 3) Faux pa 4) Joseph to jesus 5) New dad 6) Onassis to Caroline Kennedy 7) Stepparent 
Tt is generally understood that if the biological parent doesn`t give up his or her parental rights and custodial to the child, a parent`s subsequent marriage cannot create a stepparent relationship without the parent written consent. ...
• (n.) The husband of one`s mother by a subsequent marriage.
Step'fa`ther noun [ Anglo-Saxon steópfæder .] The husband of one's mother by a subsequent marriage. 
Stepfather: The husband of a woman who had a child by another man.
[n] - the husband of your mother by a subsequent marriage
noun the husband of your mother by a subsequent marriage
the husband of one's mother by a later marriage.