Doorways.

In truth, the parents-in-blood-only were all surprised when their kids were drawn to each other. It really shouldn't have been surprising, argued Janus, the god of doorways and choices. They were demigods in a country fairly devoid of demigods—that drew them together, like opposite ends of a magnet or moths to a flame.

They bumped heads and hashed out problems, none of them knowing the truth of parentage and why they interacted as they did.

Janus smiled at his relatives, bickering worse than the children they had spawned, and across the street at his grandson, Mike Stamford, who saw and knew the truth but didn't say anything, because why bother with what wasn't hurting?

Doorways and choices, indeed.

.

.