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Virtualy impossible unless it was on their medical records. You cannot find it out by using other family members blood groups either, we all get our blood group from our parents and even our grandparents.
You actually do not have to know your parents blood type to find out your own. A simple blood type test can be done at most hospitals, blood banks or red cross facilities. They are fairly inexpensive.
If both parents have type A blood then the baby should have type A blood. or type O blood
It's simple ask your Doctor for a "blood type" blood test. If your doctor has ever done blood work on you, he might have your type on file already!
For parents with o+o, they will have kids with O type blood. For parents with A+A, they will have kids with A or O type blood. For parents with B+B, they will have kids with B or O type blood. Foe parents with AB+AB, they will have kids with AB, A or B type blood.
A
If both parents are type O blood they will only have type O children
The parents must have both blood type B or blood type 0 and B.
Blood types are not related to body types. Blood is determined by your parents. There are 4 maternal and 4 paternal blood type possibilites. That then gives you 16 different possibilites.
If both of your parents have Type A blood, the blood of you and your siblings can be A or O.
If BOTH the parents have Type O blood, then their child has a 100% chance of having Type O blood. If ONE of the parents has Type O blood, then it has a lower chance. For more information, look up "Punnett Squares"
You can find your blood type in two ways, one better than the other. You can take a blood test. You can also ask you parents what their blood type is, and yours is USUALLY one of theirs, but not always.