Sisters get really annoyed when their mum tries to get them to say a particular word

Quadruples are much rarer than twins or triplets. As of 2007, approximately 3,556 sets have been recorded worldwide. Quadruple births are becoming more common due to fertility treatments. There are about 70 sets of completely identical quadruplets in the world. Many sets of quadruplets contain a mixture of identical and fraternal siblings, such as three … Read more