As Kids See It (3)

Karen, my daughter, and her three young children were flying off for a holiday.
Four-year-old Mattea listened intently as Karen carefully explained how chewing gum can relieve pressure in your ears.
As gum was shared, Mattea asked for more. Her mother refused, as Mattea often swallowed her gum.
“Well then, what do I put in my other ear?” Mattea asked. *Marilyn Norris
Questions :
1. Where were Karen and her children at the time?
2. Who was Mattea?
3. What helped relieve air pressure ?
4. How many chewing gums did Mattea want?