Focus more on themselves now that they know their children have became financially successful, and do things like take vacations to places around the world they have never been too, or change there career to something more pertaining to there likings, and conversant about what on there minds, or grow a home garden to fill that void of boredom.
Almost everyone nowadays uses a cellphone and this would make it really easy to quickly send this important message to everyone. If we email tons of people might not read it and calling each and every person would take way to long.
Active listening is the most respecting way to listen. 1) Shows eye contact 2) pays attention 3) not speaking over the person 4) Not multitasking 5) and of course listening