Possible Clues:

• Not being one's own child, one puts one's foot down over him
• Tramples boy not sharing blood
• Subdues a relative
• Treads on one of the family
• Rides roughshod over
• Adoptee, maybe
• Male offspring of partner's former marriage
• Not your own boy that puts his foot down over this
• How to encourage your boy that's not really your boy to walk
• No pests for male issue of spouse - but not of self