I find it hard to shop for people for birthdays and holidays. As I get older the best gifts I can give and receive is time. If your friends have young kids come over and babysit (plan to stay overnight and book them a hotel if you really want to amaze them). Schedule events to attend with your parents and show up enthusiastically. Trust me, they do not need more things. They just want the time to do the things that all our busy lives crowd out.