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I think there are both positive and negative. Some positives are if you want two kids then it's just on pregnancy and the kids can share clothes. Some negatives are they will be very time-consuming and it's hard to give each kid the same amount of attention. Also having twins can be very dangerous for your body.

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Genetic because for the most part it comes from the parents.

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It can be really bad on the mom and they can get a disease.

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Having a twin depends on the type of twin that was in your family history if you even have twins in your family history.

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You're more likely to have a twin as an offspring if it's in your family history.