The wife of one's father. Not the biological mom whom actually gave birth to the child but the one who sometimes...... not always though, provides half of the financial, emotional, and moral support for a child that is not from her loins. Such women will also provide a loving, disciplined, and stable structure for the step kids while the bio mom collects a tidy sum in child support(even for months when dad and stepmom have the child) sleeps with a plethora of different men (sometimes providing the stepchild with a new half sibling) and parties like a rock star.
I have to go spend the summer with my dad and stepmom. We can't go to Disney World though because my dad has no money cause my mom gets it all.