foster parent

His first war was with the city of Alba Longa, the foster-parent of Rome.

How does the young Molothrus learn to distinguish, even by sight, its foster-parent from any other bird approaching the nest?

In a Northumbrian case the foster-parent lost his charge and both eyes.

As for my foster-parent, he gradually recovered from the stupor that had overwhelmed him, but never regained his wonted energies.