According to 23andme, my younger brother and I (male) matched 64.2% with 4776 cM. That seemed weird since our matches with our parents are the normal ~50% or just under.
This is very much not my field, but from googling my best guess is I've misunderstood something, as it seems extremely unlikely that we are extremely unlikely (like, 4-sigma) outliers.
Is there a simple explanation I'm missing here?
Maybe it's because 23andme counts % differently, but it's hard to make sense of it all. In case it matters, we have 3225 cM (41 seg) half identical, 1551 cM (50 seg) full. I'm guessing the full is counted where it shouldn't be?