Neither of my parents are o and I am o positive, and my grandfather was o negative. It's called genetics lol recessive and dominate trates all depends.
How if neither of my parents have o blood then how am I O Negative and Rh negative
I'm o negative an my be is a negative our daughter is o positive
Both my parents are rh negative a and all three of us kids are also. Don't know if that helps but we all took the blood type.
Your child's blood type will not necessarily be negative, but it will be type o. My best friend was o neg and so was her husband, but her daughter came out o positive.
http://genetics.thetech.org/ask/ask114
Not nessisarily O negative but your child will have a negative blood type.