You are forgetting that in a generation or two, it will be the norm, so kids will not think twice about it. Remember, for thousands of years it has been acceptable to have one dad, and many mums. That is how millions of families are to this day.
Ancient Greeks, Romans, Chinese, Egyptians, all had same sex marriages before Christianity.
Also, it is not that long ago since interracial marriage were illegal in a lot of countries, US for one, only banned it in 1967.![]()