I don’tw where the poster got his information. I admit i never read the whole “tazvuoh” but I know personally families whre two brothers married two sisters. so I don’t see the problem. The only corrolary in this whole matter is a distant one- If -G-d forbid- one husband dies suddenly without children, then the wife would not be eligible for “yivum’ by the other brother. she becomes a “tzoroh”, which is not eligible for yivum.
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