Can your father and mother have Rh positive factor and you be Rh negative?
YES. Maybe both of your parents are half-Rh positive, but not a
full-blown Rh positive. Your parents will have 25% chances of
getting a Rh negative offspring (Out of 4 children, only 1 become
Rh negative)
This comes true in our family. Both myself and my husband are Rh
positive and our kid (3 years) is Rh negative. My blood group is
B+ve, and my husband is A1B+ve and our kid is A1-ve.