It is insane the lack of manners parents teach now. My neighbor introduced me to her daughter who she had hoped to babysit my kids, and her daughter was too busy texting to speak me or the kids properly. Needless to say, she didn't get hired.
I also made sure to mention to the girl I did hire that I didn't want her texting while babysitting. Sure-hypothetically, she could handle some texts while watching kids, but if she's a textaholic, I'm NOT interested in her caring for my kids for safety reasons. Her mom, who was with her, said she does not have a text feature on her phone, and she would only have it with her if it made me comfortable, otherwise she could use my land line to call for help. SLAM DUNK!!!!, You GO, MOM! The kids love our new babysitter, and I love her too.
We were required to be courteous and attentive to company as kids, but somehow teens today have carte blanche to be preoccupied with their friends CONSTANTLY and it's a big tragedy if they don't talk to them for a couple of hours-let alone days. Wait-let me get my cane "When I was a wee lass, we had to talk to our friends-those rare brave souls who dared call our house that is- on the land line with the short cord with my parents glaring at us to get off after five minutes and demanding to know who was calling."
Unfortunately there is nothing you can do about OTHER people's kids. But if it's your sister you can state your opinion about it or make some wise cracks to the teens about their rudeness.
When my kids get older, if phones are still the thing and they don't have laser implants by then to send brainwaves to their friends, as long as I am paying for the phone, they are having calls only, no texts and no cameras. When they pay for it themselves, they can text but still adhere to manners and never in the car. They will be told as long as they live under my roof I will check their phones to see if there was any activity while they were driving and if there was there will be hell to pay. My three kids and I nearly got hit by a teen on her phone the other day. I'm over it. Spoiled brats.