Or there is a more likely explanation. If you will allow me?
Mr. Cakes impregnated them both.
Given that one of the twins matches his mane and body color, Mr. Cakes definately was the male genetic donor. Given that 2/3 of the party were female, it isn't much of a stretch to say that he may have shot more than once. What's a deity to do with a bun in the oven? Why, teleport the little fellow into the womb of someone who is already carrying their half-sibling anyway.
Would explain the lustful eye Molestia kept giving Mr. Cakes....
So yeah. Mr. Cakes as stud to the gods....who knew!