The other catch is that while the occasional offspring from cousins have almost no genetic danger, if your father and his brother married cousins, and your grandfather married cousins... sooner or later you will have a few too many great grandparents and start to get closer and closer to having "cousins" that look genetically closer to "siblings".
[First] cousin marriage is banned in a few US states, but mostly thanks to being abused by families trying to create a closed aristocracy by continually marrying cousins within small families. Not sure if they hit genetic damage or outsiders got real tired of it, but a few more generations and they'd get like Charles II.
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@CorruptUser
The other catch is that while the occasional offspring from cousins have almost no genetic danger, if your father and his brother married cousins, and your grandfather married cousins... sooner or later you will have a few too many great grandparents and start to get closer and closer to having "cousins" that look genetically closer to "siblings".
[First] cousin marriage is banned in a few US states, but mostly thanks to being abused by families trying to create a closed aristocracy by continually marrying cousins within small families. Not sure if they hit genetic damage or outsiders got real tired of it, but a few more generations and they'd get like Charles II.