since this is the family forum, I'll talk about my experiences with tongues, and how it affected my family.
I've spent time in many different flavors of pentecostal churches over the years.
I'm generally in favor of greater use of charasmatic gifts among believers today.
I can't think of a single instance, in my experience, where the body of Christ was built up by a person speaking with tongues.
compare with, say, being with a hurting person, taking their hand, and praying with them... many edifying experineces I've seen...
finally, about my family growing up... I, my mother and her mother all spoke with tongues... my father was brought up in a holiness movement, but non-tongues using church, and he didn't. I sensed an on-going air of superiority with us tongue-speakers... like maybe someday my dad would be able to do this, too... and experience God's fullness.