Both our parents are in their late 60s. Mine used to watch DS1 here and there for special occasions and sometimes date nights. They live 40 minutes away so it isn't super convenient for short amounts of time. But since we've had DS2 (he's 15 months), they haven't really watched both boys. I get the feeling that my parents are overwhelmed by having both of them. I miss having those occasional nights out without spend $$$ on a babysitter. If you have more than 1 LO do your parents watch them both?
ETA: I guess I'm not being fair/accurate. They have watched them a few times, during the day or for a couple of hours at night, at our house.