Possible Clues:

• Subdues new spouse's child
• Relative makes his way over
• Family man working after flight
• How one puts one's foot down over the one that is not one's own child
• Relation, not by blood
• Spouse's child from previous marriage
• Crushes a member of the family
• He must take staircase - no lift!
• Male child of spouse by earlier marriage
• Not really your boy that puts his foot down