When the phone rings at Susan Manion's house in Silver Spring, Md., her three children, ages 16 to 23, almost never answer it.
"They know it won't be for them," says Manion. "They just let it ring."
Across America, a symphony of unanswered house phones reminds us that there has been a sea change within families. More than half of all teens now conduct their lives on their own cell phones, or in a zillion online "instant" conversations parents never see, according to studies by MindShare Online Research and Consumer Electronics Association.
Children today have been labeled "the connected generation," with iPods in their ears, text messages at their fingertips and laptop screens at eye level.
But their technology-focused lifestyle can leave them disconnected from the wider world, especially from their parents.
Many teens won't give friends their home numbers, says Samantha Landau, 15, of West Hills, Calif. "They don't want friends to talk to their parents because they don't want their parents to know about their lives."
It's easy to assume that these are just perennial generational tensions in new high-tech boxes.
But technology has exacerbated the gulf between today's parents and kids in ways we need to notice. It's easier for kids to function in their own closed societies, leaving them oblivious to adult culture.
People over age 40 grew up with just a few TV channels. We watched TV news and soaked up the adult worlds of information and entertainment since that's all that was available. Now kids have their own worlds, their own channels.
I live in Michigan, and two days after Hurricane Katrina hit, I drove my 16-year-old daughter and her friend home from the movies. I mentioned Katrina, and this friend didn't even know there was a hurricane.
She's a lovely girl and an A student, but for days, she had chatted online, watched her own TV shows, and saw no news of the tragedy. Her parents hadn't thought to tell her.
Landau says she mentioned new Supreme Court Chief Justice John Roberts to fellow students in her 11th-grade Advanced Placement history class, and most had no idea who he was.
Baby boomers knew newsmakers from their parents' and grandparents' generation because families watched Walter Cronkite and Ed Sullivan together.
But most 20th-century legends are "dead brands" to kids today, youth marketers say. To them, historical figures are last season's reality-show contestants.
Certainly, young people today are entitled to their own heroes. And truth is, surveys dating back to 1915 show kids have always been uninformed about U.S. history. Still, today's parents often indulge ignorance.
More than half of our kids have TVs in their rooms, according to a 2004 American Psychological Association report.
One mother I interviewed refers to her son's bedroom as "the technology cave." He has a TV, computer, stereo, iPod and cell phone. She won't allow food in his bedroom because "that forces him out into the open with us."
There are other ways to bring techno kids into the wider world. For starters, immerse yourself in their world. Ask them to go online to help you find Katrina relief groups. Let them teach you complex video games. Then be the adult and say it's time to turn everything off and come to dinner.
Yes, we should encourage kids to read books and newspapers. But we also must recognize that they collect information from unorthodox sources: blogs, cyber gossip, advertising, comedians. The Internet is filled with shady truths, and kids try to determine which outlets are trustworthy, says generational marketing consultant Ann Fishman. "If it's good, they go with it. If not, they don't. It's called 'Internet thinking.' They don't have a Walter Cronkite." Six million young people are using America Online's Red service for teens, which is designed to ease parents' concerns by controlling Internet access.
Still, AOL's service is purposely edgy, with its teen Q&A offering titled "Truth or Crap." A Web page called "True or False" wouldn't work for today's kids, says Malcolm Bird, senior vice president of AOL's youth area.
"You have to speak to them in relevant terms." The lesson for parents: Even "safe" sites mimic the coarseness in our culture. Know what's there.