Mary's younger sister, Brandi (Nichole Hiltz), is very much her mother's daughter and the baby of the family. Never having bothered to get an education, she lived most of her life in the moment and tends to fall for the worst possible men (like mother, like daughter).
After a series of misadventures, run-ins with law enforcement and failed career attempts, Brandi is finally getting her life together. Much to Mary's surprise, Brandi has put her penchant for bad boys aside and has settled down with local automotive mogul Peter Alpert. This season Brandi and Peter take their relationship to the next level after Peter pops the question, but Mary still doubts that her little sister has what it takes to actually commit and marry a perfectly nice, wealthy, and charming man.