Thankfully, my parents haven't been pestering me about this. My mom doesn't have the itch to be a grandmother. She would love it if it happened, but she respects our decision not to have kids and never bothers us about it.
My cousins, however, are a different story. They won't stop talking about what a great parent I would be, because I'm so straightforward with their kids.
And now 3 of my husband's cousins are expecting babies (all of these cousins are siblings too, so their mother is going to be a grandma x 3 next year). Of course, they announced this at Christmas Eve and everybody was just over the moon about it. Hubby and I were not with our families at the holidays (since we live in Germany and can't afford to go home for every holiday), so we're kind of glad we weren't there. The pressure on us would've gotten tremendous. We've told EVERYONE in the family that we DO NOT WANT KIDS EVER, but of course, nobody listens. They think they can convince us eventually.