Twins, Triplets, Quadruplets? The world has a long standing obsession with multiples.
Multiples come in all forms and combinations.
You can have triplets within quads, and twins within triplets. You can have a set be identical while the others are fraternal; the possibilites are endless.
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More often than not, they are a total surprise.
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In other cases, you come to expect them:
Identical twins Diane and Darlene Nettemeier married identical twin brothers Craig and Mark Sanders, and they both gave birth to a set of identical twins!
Source: current.com