You probably knew that the adorable Hanson boys were all grown up. They're still out there, touring and covering Taylor Swift songs, after all. But were you aware precisely how grown-up the three Hanson brothers are? Well, allow us to potentially blow your mind a bit: Today middle brother Taylor Hanson welcomed his fifth child, a baby girl by the name of Wilhemina Jane Hanson.

Taylor's not the only prolific breeder in the band. Older bro Isaac and baby-of-the-band Zach also have two moppets each. If you're counting along, that brings us to a grand total of nine Hanson Juniors—enough to fill out an entire baseball starting lineup. Here's your guide to the MMMTots (yes we did!) of Team Hanson.

Child: Wilhelmina Jane

Parent: Taylor

Age: One day!

Name Means: The female version of Wilhelm, Wilhelmina originates from German, where it means "protector." It was also the name of a Care of Magical Creatures professor in the Harry Potter series.

Family Nickname We Just Made Up: Willy

Instrument in Future Multigenerational Hanson Family Supergroup: Glockenspiel

Child: Junia Rose Ruth

Parent: Zac

Age: 22 months

Name Means: It's a reference to the woman many Biblical scholars believe is the only female apostle.

Family Nickname We Just Made Up: Junebug

Instrument in Future Multigenerational Hanson Family Supergroup: Harmonica

Child: Viggo Moriah

Parent: Taylor

Age: 3

Name Means: It's either a variant on the Old Norse name Vigge ("war) or the Icelandic name Vöggur ("he who lies in a cradle).

Family Nickname We Just Made Up: Aragorn

Instrument in Future Multigenerational Hanson Family Supergroup: Triangle

Child: James Monroe

Parent: Isaac

Age: 4

Name Means: The Last of the Crooked Hats himself!

Family Nickname We Just Made Up: The Child of Good Feelings

Instrument in Future Multigenerational Hanson Family Supergroup: Banjo

Child: John Ira Shepherd

Parent: Zac

Age: 4

Name Means: It's Hebrew for "God is gracious."

Family Nickname We Just Made Up: Ira Glass

Instrument in Future Multigenerational Hanson Family Supergroup: Sampler

Child: Clarke Everett

Parent: Isaac

Age: 5

Name Means: Clarke is an Irish surname that originated as Ó Cléirigh, a clan of poets and historians in medieval Ireland.

Family Nickname We Just Made Up: Lewis And

Instrument in Future Multigenerational Hanson Family Supergroup: Pennywhistle

Child: River Samuel

Parent: Taylor

Age: 6

Name Means: "My parents are hippies."

Family Nickname We Just Made Up: Phoenix

Instrument in Future Multigenerational Hanson Family Supergroup: Electric Violin

Child: Penelope Anne

Parent: Taylor

Age: 7

Name Means: Penelope means "cunning weaver," according to scholars of ancient Greek who study the Odyssey.

Family Nickname We Just Made Up: Penny 'Ane

Instrument in Future Multigenerational Hanson Family Supergroup: Saxophone

Child: Jordan Ezra

Parent: Taylor

Age: 9

Name Means: It's Hebrew for "he who descends."

Family Nickname We Just Made Up: J-dawg

Instrument in Future Multigenerational Hanson Family Supergroup: Gutbucket

Now we're going to show you a bunch of pictures from the Hanson brothers' '90s heyday, just to weird you out!

Remember: All three of these baby-faced teens have fathered multiple children!

Let's just say this all makes us feel ... a little bit weird.