According to a tree on Ancestry my g-g-grandfather's mother was only one year old when she had him!

Furthermore, according to the same tree, g-g-granddad (who was transported to Australia in 1846) is on all the England Censuses from 1841 to 1881 despite having married (1) in 1849 and (2) in 1868 both in Australia and having had 4 children all born in Oz between 1850 and 1875

(Also they have wrong place of birth, and wrong siblings.)
This info has been copied onto no less than 6 other trees, just shows how much care some people take in checking their sources.
In a way I wish these people
would copy my tree - at least then they wouldn't be spreading such rubbish.