Is it possible for someone to have a completely different blood type from the rest of their family?

I want to know because everyone in my family, brothers, parents, grandparents are all a positive blood type and i'm negative. Also everyone in my family has either bright blue eyes or brown eyes and mine are green. My mother swears that my father really is my father but i'm not sure and I dont want to insult him by asking him to do a paternity test. Any help would be appriciated. Thanks.

my father is B+ my mother is A+ and i'm O- both of my brothers are A+

As far as the blood type is concerned, no there is no possible way to have a completely blood type from the rest of the family. At the same time, remember that the Rh factor is not simply positive or negative.

The Rh factor genetic information is also inherited from our parents, but it is inherited independently of the ABO blood type alleles. There are 2 different alleles for the Rh factor known as Rh+ and Rh-.
Someone who is "Rh positive" or "Rh+" has at least one Rh+ allele, but could have two. Their genotype could be either Rh+/Rh+ or Rh+/Rh-. Someone who Rh- has a genotype of Rh-/Rh-.

Just like the ABO alleles, each biological parent donates one of their two Rh alleles to their child.
A mother who is Rh- can only pass an Rh- allele to her son or daughter. A father who is Rh+ could pass either an Rh+ or Rh- allele to his son or daughter. This couple could have Rh+ children (Rh- from mother and Rh+ from father) or Rh- children (Rh- from mother and Rh- from father).

If you are so curious, then try to consult your family physician, who is more familiar with all of your blood types.

I understand your mother's concern, but after consulting your family physician, you may bring the subject up to your father as a way to discuss blood types. Talk about it as a school/science subject, and then offer to use the family blood types for example.

Best of luck...

It's possible to have a different blood type and even eye color. Both my parents have green eyes and I have blue.

Maybe it's just that you somehow got two recesive genes.

yes you may have adifferent blood type from your siblings and parents since each type actually consist of two parts, Type A can actually be A or AO, so there can be many permutations, the same with the rh factor. There are combinations that can not result to certain type however we need more details for that (your specific blood type and that of BOTH parents)

It is absolutely possible. I had this same experience when my daughter was born. Both my husband and I had a positive blood type. My daughter came out negative. I asked the Dr. how that could happen and he told me someone in my family had a neg. blood type. I didn't believe him so I called the blood bank at the hospital. They ask if my Mom or Dad had a neg. blood type. I said my Dad, my sister, and my brother. They told me that because my Dad had a neg. blood type I carry both a neg. and a possitive gene. My daughter took the neg. gene and my son took the pos. gene. Now both of my kids carry both genes. It can go way back to your grandparents or great grandparents. You now carry both genes as did one of your parents and your kids will too. The eye color can also come from grandparents and great grandparents. I have a cousin whose Mom had 9 kids and only one came out with neg. blood but they all had the same Dad. Don't worry. It happens all the time.

It is possible for your whole family to be positive and you to be negative. You receive to Rh types from your parents at birth a positive and negative (negative is reccesive) Both your parents must both have the negative recessive trait and passed it onto you. Since neither of the ones you received
were the dominant positive Rh factor you have a negative blood type. If both your parents were negative and you were positive then, I would say you were adopted since to be negative both of your parents Rh pairings would have had to be negative.

Here's a little chart to demostrate:

Genetic makeup Blood type
++ Rh positive
+- Rh positive
-- Rh Negative