Some boy bands with three members that existed in the 90's include:
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Greenday....really good band
Three Dog Night, Cream, Jimi Hendrix, Rush, ZZ Top, Crosby Stills, Nash and Blink 182
Jimi Hendrix is a person, the Jimi Hendrix Experience had three members - so did Nirvana
America, Emerson Lake and Palmer, Hamilton Joe Frank and Reynolds. The Three Stooges
3T (nephews of Michael Jackson)
911 (british 90s boy band)
Hanson
No mercy
LFO
The Jonas brothers
BeeGees
Busted
Beastie boys (not exactly a boyband but 3 members)
All i can think of at the moment, please feel free to add to the list.
I believe its the band of Hanson. THey had the song entitled Mbop. They were all brothers and had long blond hair
there's green day and the Jonas brothers, but that's all that i can think of. there might be more. Nirvana, Beastie Boys, Rush, Cream, ZZ Top, Everclear, Sublime, Silverchair, Three Dog Night, Crosby Stills Nash, Run DMC, TLC, Eve 6, Police Three Dog Night is a band that had three lead singers, the group was seven people. They same is true for CSN, I think.
The male vocal group N'SYNC disbanded due to some band members having desires to pursue solo opportunities with full focus.
Avenged Sevenfold.
Rage against the machine
The School of Worship Band 2011-2012 lead these band lead worship for the Acquire the fire Normals Not Enough Tour 2011-2012 Daniel Morell Drum Tim Hannabas -Bass Cole Henry -Electric Nathan Wiebe - Lead Electric Hannah Lockard -Keys/Syth and BGV Melody Rain -Lead Female Vocal Erik Stabel Acoustic and Lead Male Vocal Clifton Peaches Drum Luky Tsering - Bass Matt Kramer Lead Electric Melany Jean Keys /BGV Hannah Nelson Lead Female Vocal Cory Everett Rhythm/Acoustic Guitar and Lead Male Vocal