Yes, we could be also frogs, so its maybe not so good if we do not appreciate the generosity of our ancestors. Or as Ajahn Fuang once said: "How can I blame anyone else? Nobody ever hired me to be born. I came of my own free will."
But there is also a good saying of him if the opposit arises:
§ Once, when one of Ajaan Fuang's students was being pressured by her parents to look for a husband so that she could settle down and have children, she asked him, "Is it true what they say, that a woman gains a lot of merit in having a child, in that she gives someone else the chance to be born?"
"If that were true," he answered her, "then dogs would get gobs of merit, because they give birth to whole litters at a time."
Just that! *smile*
BUT! it is important to become a real Buddhist first. Like Punna did: Nate sante baram sokham _()_