We're in position to help our two grandchildren, even if they end up not needing it. Even if our unmarried son has one some day, that's a small number.

Working through the extended family tree looking for second and third cousins, I have distant relatives with large numbers of offspring, such as one with 35 grandchildren at the time of her death, and another one with 28.

You can't be tight with that many of them, or do much to help financially. Of course, financial support is not your responsibility anyway.