One Lookup from multiple fields

One Lookup from multiple fields

I have one form with fields for the names of the members of a family:  Mothers_Name; Fathers_Name; Sibling1; Sibling2; Sibling3.  There is also a field for Family_Id. 

On another form I would like a dropdown to select a family member after the user enters the Family_ID.

Is there a way to create a list of values from the multiple fields on another form?  

Herb Wexler