@Nunally ...or her kids had more than two kids each. Getting ten kids wasn't that uncommon during the early industrialism, or if you were fairly wealthy before that, and her blessing was then that all ten kids grew up strong enough to get ten kids each of their own.
(Fewer kids and grandkids are also possible if she includes 'great-grandchildren' in the count as 'grandchildren' since from a parenting perspective they're pretty much the same - kids into the family that you didn't have to carry or bring up yourself
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@Doomer Because it was a harmless (i.e. nobody's physically hurt) prank? Which he also failed at, so the only one embarrassed was he?