It is necessary to establish the fact of biological relationship, legal adoption,
            or steprelationship through a marriage to the biological or legally adopting parent.
         
         If steprelationship is involved, the marriage to the child's parent must:
         
            - 
               
            
- 
               
                  • 
                     Not have ended in divorce or annulment. 
 
 
The deemed marriage provision cannot apply to a “stepchild” (through deemed marriage) of the NH's or spouse's child.