'Daddy's Home' Trailer: Will Ferrell Is Stepdad to Mark Wahlberg's Kids

Being a stepdad isn't easy.

Forget Step Brothers, it's time to talk about being stepfather. 

The first trailer for Daddy's Home introduces Brad (Will Ferrell) to his stepkids' biological father Dusty (Mark Wahlberg), who happens to be (as someone in the trailer puts it), his "superior in every way." Brad is a square, while Dusty is a total badass — and a special-ops agent to boot.

The film comes five years after Ferrell and Wahlberg teamed for The Other Guys.

The Paramount/Red Granite film hits theaters Christmas Day and is directed by Sean Anders and John Morris.