Mindy just turned 18 and her older step sister is 23. Their older step brother 25, also adopted, has always had fun pitting these two against the other for his approval and pleasure.
Mom is clueless as the first round is the normal aggressive but playful wrestling match these two have had for years.
The real fun comes when mom goes to bed and the two step sisters, still not happy, have a rematch with their step brother as the judge to settle who is his favorite and the alpha sister for the year.
