Medical Questions > Relationships > Relationships and Marriage Forum

Fifth cousin marriage

Hi All,

My parents are forcing to marry my own sister's daughter. But I am thinking about our baby may born with some disorders OR may be abnormal as this is 4th or 5th generation. My mother married her cousin, and my sister also married her cousin/uncle.

Can any one of you please let me know the chances of getting healthy baby if both marry?

Thanks,
Sreenu
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replied March 23rd, 2009
Community Volunteer
Hi sreenub and welcome to ehealth:

I am not sure of the statistics, however I am sure that they are not as good as they would be if you did not marry a relative......Possibly you could talk with them about this and discourage marrying a close relative...Using this medical fact of life, just may help....

Good luck,
Caroline
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replied March 23rd, 2009
Supporter
May I ask what your background is? Race, religion, location? I know of only a few cultures or religions that practice intermarriage and arranged marriages so I'm curious to know more about you.
I believe that it is very dangerous for you to have children with your niece. The two of you share at least 12.5% of your genes, the same amount of genes that half brothers and sisters share. When you add the fact that your mother and father are related, that raises the number of genes you and your niece share, which means you are much more likely to have children with diseases.
To put it another way: if you have a gene that causes purple spots and you marry a relative, chances are that they also carry the gene for purple spots. So, your children will probably have purple spots. If you marry outside of your family, chances are very slim that your wife will also have the gene for a disease that causes purple spots.
I'm very surprised that you don't have any diseases that run in your family since they have been intermarrying for so many years. Be strong and stand up for what you think is right.
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