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I had two kids with my sister and they were fine.

In modern western society, marrying your cousin is not well accepted, particularly in the United States.

Double first cousins have both sets of grandparents in common.

These people were strong enough to sail across an ocean, prosper in an unknown land, and survive the various scourges to which they were exposed as well as harsh climates.

Proponents here point out that few would advocate banning a 40 year old woman from having children.

Asking for help, clarification, or responding to other answers.

It was shocking for me then.

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First cousins marrying in 21 st century America discover that many states no longer regulate the practice.

I actually think that having a blood relative family bond with your spouse makes for a stronger and more trusting marriage which is the case in many societies where cousins marry and is so lacking in western countries.