you're not a bad grandma but get ready for a large dose of guilt if you say "no" and a larger dose of, "I want my freedom back" if you choose "yes". Just remember, once you start helping you can't walk away from the decision of the "yes". My husband told our youngest son he'd never let him down and has been watching grandson's for over 6 years and they're talking about another. He's stuck...I travel, without guilt. My sister...same situation but 8 years and was just surprised with a brand new grandchild a month ago. I have wanted to be a great grandma since I was a little girl because I hated mine and I am because I see them when I want to. I am their grandma, not their babysitter, not their taxi, not their atm, not their parents. I don't answer the back on call of, "we need a nap", "we need time to talk to each other without the kids around", "the wife has had a stressful day with the kids can you watch them for a few hour so she can nap"? Parents need to accept their responsibilities as parents and let grandparents be grandparents when we choose to be and are not conveniences to be used when convenient. Good luck, it's a hard, emotional decision with LONG TERM consequences.