A lot of adds and tv shows have mixed race couples. We have to get to a place where this isn't viewed as a good thing or a bad thing, but just a thing.
Except that's not a picture of a mixed-race couple, but of a couple and a kid that pretty obviously didn't come from them. Given that they couldn't have a kid anyway adoption is likely, though, and it shouldn't be considered strange.
My point is ...they could be brothers and one of them has a son, we have to get beyond the point of assuming anything and just let things be what they are.