It depends on if your mom is an identical or fraternal twin. Is she is a fraternal twin, your chances do go up a bit to have fraternal twins yourself. If she is an identical twin, it is about a .05% chance since they are a gift from nature. There are some saying that they can run in the family with the sperm carrying a certain type of protein and the female's egg being receptive to it. It is still a low percentage.
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