I received the following question:
Is Bithiah the daughter of Pharaoh who marries Mered the “foster-mother” of Moses (1 Chronicles 4:8)
I see no way of confirming or denying this. Other than that these were descendants of Judah, Mered’s line goes back to Ezrah, and then stops, as we don’t know who Ezrah’s father was. Even less do we know which Pharaoh or which daughter are the ones mentioned here.
If I was to guess, I would suppose that this union was probably made while the Israelites and the Egyptians were still close allies. In these circumstances, it would not be unusual for a son of a wealthy and powerful head of an Israelite tribe to marry one of Pharaoh’s daughters. The Pharaoh in question then would be one of the same dynasty that so closely allied with Joseph and his family. One of the next dynasty of Pharaohs, who were enemies of the Israelites and enslaved them, would hardly have been likely to have allowed one of their daughters to marry an Israelite, even a head man among his tribe, since this would have meant marrying a slave. So while there is no way to confirm it, my guess would be that this was not the same woman.