“Five children spawned 14 grandchildren and 16 great children”
...and here is the problem. 14 grandchildren, probably all of which are at least old enough to have kids, should have a lot more than 16 kids between them. This is called losing the demographic war.
The 14 grandchildren may be spaced out. In some families, sibblings and/or cousins may have an age difference of 20+ years. Some of the grandchildren may have fertility issues. Some may be single by choice.