Life as We Know It (2010)

Holly and Eric were set up on a blind date by their married friends Peter and Allison, but it didn't go well. After Peter and Allison are killed in an accident, Holly and Eric learn that they have been named as the guardian of their late friends' infant daughter Sophie, so they move into their house and try their best to honor their friends' wishes. But raising a child cramps their style--and they still don't exactly get along.