However, in " Sibling Rivalry ", just the opposite happens where Lois gains a ton of weight after Peter has a vasectomy and loses his sex drive. Family Guy Video Game! After Family guy lois griffin quest for fur back in time a few more times, Peter finally gets things back to normal, luckily for Lois. As if her emotionally distant parents weren't bad enough, Lois also has to contend with a psychopathic brother. Lois is also featured on the Family Guy: Website for moms seeking advice, community, and entertainment.