[SFConservative]

My older brother had his DNA history done through 23&me. That’s just like me having my DNA done I would think. Maybe I’m wrong but wouldn’t we have the identical DNA?

DNA of brothers would tend to be very similar especially if the milkman and the postman were identical twins.

[Grampa Dave]

Your DNA would be similar, but not the same.

One of my siblings has very similar DNA as mine and so does her daughter and grandkids via her daughter/my niece/

The biggest variances seem to be with the minority DNAs.