When Pete and Ellie choose to start a family, they stumble headfirst into the world of foster care adoption. After they learn their perfect foster child comes with two other siblings, Pete and Ellie find themselves speeding from zero to three kids overnight and must hilariously learn the ropes of instant parenthood if they hope to become a real family.

Marty Bronson raises his son and daughter on his own. He has to sell his homey motel to Barry Nottingham who promises to make Marty's son manager. But, Nottingham pulls down the motel and builds a pricey hotel. Now grown up, Marty's son, Skeeter, works as a janitor and general servant. He still dreams of becoming the manager. When Nottingham announces a brand-new hotel, built on an existing school's property, he makes his future son-in-law, Kendall,...

Now adults, Theodore Templeton and his estranged brother take a magical formula that transforms them into babies for 48 hours. Together, they must now go under cover to prevent an evil genius from turning fellow toddlers intro monstrous brats.