Whether you're pregnant with twins or just curious about the many different types of twins, keep reading to learn more.

Here's the lowdown on fraternal and identical twins, as well as more unusual types such as semi-identical.

Why Identical Twins Are Usually the Same Sex The terms "identical" and "fraternal" don't describe what twins look like, but how they form. The different types of twins are classified by zygosity ...

Fostered by their parents’ need to control their twins, this type of estrangement develops based on fear of outsiders during childhood. The stronger twin grows to resent taking care of their ...