Columbia subject headings:
Children--Legal status, laws, etc.--Congresses.
Marriage law--Congresses.
Marriage--Congresses.
Unmarried couples--Congresses.
Unmarried couples--Legal status, laws, etc.--Congresses.
Harvard subject headings:
Children--Legal status, laws, etc.--Congresses
Marriage law--Congresses.
Marriage--Congresses.
Unmarried couples--Congresses.
Unmarried couples--Legal status, laws, etc.--Congresses.
Princeton subject headings:
Divorce--Congresses.
Domestic relations--Congresses.
Marriage--Congresses.
Unmarried couples--Congresses.