Twin cousins explain how they are also brothers

How Common Is Having Twins?

Multiple births – which include twins, triplets, quadruplets and more – have become more common in recent years, partly because more couples are using fertility treatments. Another factor is that on average mums-to-be are becoming pregnant later, which can also increase the likelihood of a multiple birth. Today in the UK around 1 in every 65 births are twins or other multiples, compared to 1 in every 100 births in 1984.