I have noticed recently that a vast swathe of TV ads use mixed-race families, which helps normalise them in the eyes of the average TV viewer. There are also a good number of gay and lesbian couples in ads these days. It becomes hard to remember when that wasn’t so. Here is a great ad by Guinness from 1995.
1995 is not a long time ago, but Guinness were forced to cancel the ad just before its showing due to the number of complaints and the vicious media backlash they received.
Jak's View of Vancouver v.3 