How does having the same mother and different fathers make you a whole sibling verses have the same father and different mother Doesn't the dna of the father determine that?

half.

I think what you mean to ask is "is DNA testing reliable to determine siblingship in two individuals with the same mother but not the same father?" The answer is, yes, but it depends. DNA is the...

A DNA test cannot give 100% proof of any relationship. It can only tell you what percentage of your genes are similar to another person's. For example, you might be 50% the same as another person,...

My father had an affair early in my parents' marriage. I found out at the age of 27 that I had "another sister". Now, due to the fact that we obviously have different mothers, I refer to her as my...

that would be a half broher a half-brother