@IrmaFayLear
Unfortunately there's always someone lurking around who is keen to put the boot in. SIL is mega smug that she has all four adult dds living at home/close by and when my dc went to university there were lots of head tilts and "How sad" and " We're such a close family" comments.
Urgh how rude. Someone assuming that their kids love her more than yours love YOU, purely because they have not left home (probably a decade or more into their adulthood!)
I think it's a good sign that you have raised strong, independent, confident young adults who are brave and confident enough to fly the nest. I cringe inside when I meet people 50+ who have several children aged 25+ who are still living at home.
I know one woman who has three children - two sons and one daughter, aged 33, 31, and 29, all still living at home. 2 of them don't work, and pay nothing to her for board money, and the third one only works 18 hours a week, and pays her £15 a week! 
Also know several other families with 2 to 4 children who all still live at home, some well into their 30's are still there. The longer they stay, the more dependant they will be on you. Going to university is the making of many young people. Unsurprisingly, not one of these people who still live with their parents, more than a decade after reaching adulthood, went to university.