Dear Amy: Some time ago, I found out that my 20-year-old granddaughter “Sally’s” ex-boyfriend, “Jason,” is calling and texting Sally’s 13-year-old sister late at night. When I expressed my concern to these girls’ mother (my daughter) that a 20-something male was calling and texting a 12-year-old (she has since turned 13), her mother brushed it off, saying that he had always been close to Sally’s younger sisters, and anyway — he lives five hours away. This has been going on for months now, and I find it inappropriate, no matter how far away he lives. Jason and Sally dated for about two years, but I don’t suppose Jason saw the younger sisters more than half a dozen times in that time.