that was good idc call me sweet home alabama but it was good

I keep seeing this phrase “sweet home Alabama” in every story containing incest. What does it mean??

They say it whenever it's uncle nephew or even father x son etc when it's incest with blood and flesh you got it?

sweet home alabama is an song, it has nothing to do with incest per see, but the meme is that in the alabama state, incest is a common thing