At my day-job office, they put seasonal photos up in the elevator.  In honor of Mother’s Day, they have stills showing Linda Hamilton from Terminator 2, the Alien Queen from Aliens, and the desiccated corpse of Norman Bates’s mother from Psycho.

The latter two at least don’t seem to be particularly in the spirit of Mother’s Day.  But they do feature mothers, so I guess these count as Mother’s Day movies in the same way that Die Hard is a Christmas movie.