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Can Biological Siblings Have Different Blood Groups?

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Posted on Fri, 7 Mar 2014
Question: My two sisters have O+ blood type and I have AB+ Is it possible for us to be biologically related?
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Answered by Dr. Gaurav Katiyar (1 hour later)
Brief Answer: Yes Detailed Answer: Hi, I have gone through your query. Your two sisters have O+ and you have AB+ blood group under ABO blood grouping. Yes, it is possible that all of you are biologically related. From this, it is clear that that Your father and mother have A+ and B+ blood group respectively or vice versa. Hope I have answered your query. If you have any further questions I will be happy to help.
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Above answer was peer-reviewed by : Dr. Raju A.T
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Answered by
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Dr. Gaurav Katiyar

General & Family Physician

Practicing since :2008

Answered : 642 Questions

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Can Biological Siblings Have Different Blood Groups?

Brief Answer: Yes Detailed Answer: Hi, I have gone through your query. Your two sisters have O+ and you have AB+ blood group under ABO blood grouping. Yes, it is possible that all of you are biologically related. From this, it is clear that that Your father and mother have A+ and B+ blood group respectively or vice versa. Hope I have answered your query. If you have any further questions I will be happy to help.