I said "no" in your position (about 8 years ago) and although my son and daughter-in-law couldn't understand why I said no (and were a bit surprised and disgruntled) they quickly got over it and sorted it out without me.
I still help out in an emergency of course and occasionally at weekends.
But no feelings of regret!
Don't feel bad.
What's going on , on the street outside your home right now?


