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This project is of twins and multiples who are a part of one family unit that has more than one set of twins/multiples.
This means both or at least one of the parents have had twins or multiples at least two times.
The Royal College of Midwives estimated that the odds of consecutive sets of twins were more than 700,000-to-one, noting that it is more common when multiple pregnancies are separated by singletons. The National Organization of Mothers of Twins Clubs claims that once you have had fraternal (dizygotic) twins, your chances of having another set are three to four times greater than that of the general population. Compared to the general population, only one in 30 births are twins or slightly more than 3 percent.