9x16 - 7th Heaven

When Simon asks Matt to prescribe birth control pills for his current girlfriend, a false rumor spreads through the house that she is pregnant. Meanwhile, Lucy and Kevin have to decide whether to sell their new house back to its previous owners, Eric and Annie are upset that Kevin has been keeping a gun in the house for protection. Lastly, the Camden kids attempt to hide a big secret about Mary (Jessica Biel, who does not appear in the episode) from their parents.