In my case, not sister, but first cousin. I couldn't have married my sister, our relationship was too up and down. But cousin marriage should work if sibling marriage does not. This is very common among the Bedouins. There were at least 2 of them I could've married, or more if I'd been willing to also consider 2nd/3rd cousins. And this would've also kept the family property together rather than splitting it all up and mostly losing it as my idiot uncles and aunts caused to happen because they are selfish, short-sighted boomer trash. It's hard to overstate what a disaster of civilization they caused.