It happens rarely because of population decline

It happens in some species. What is worth noting for interests sake, is that both clones from the mother, were male. This happens because while in mammals like humans, males have an XY chromosome combination and therefore must have, both a male and female parent. In birds it is the opposite, males having two identical chromosomes, so that one or a doubled copy will yield a male, while female is determined in birds by having the equivalent of a Y passed down from the father. Ain't nature cute.

Parthenogenesis. They probably lie just like Mary did.