Genesis 41:1 - 57
ESV - 1 After two whole years, Pharaoh dreamed that he was standing by the Nile. 2 And behold, there came up out of the Nile seven cows attractive and plump, and they fed in the reed grass.
For follow-up discussion and general commentary on the topic. Comments are sorted chronologically.
First, it is clear that Joseph was "given" a wife by Pharaoh. Joseph had just come from prison to interpret a prophetic dream for Pharaoh. When the dream was interpreted, the king honored Joseph with a high-ranking office in Egypt and placed him in charge of preparing for a future famine. Joseph's rewards included a new position, a new Egyptian name ("Zaphenath-Paneah"), and an Egyptian wife. Joseph was not given a choice regarding whether to take Asenath as his wife.
Adding, to what you just said Michael. Joseph no doubt won his wife over to the Hebrew faith, and as a result, the two children were raised in the Hebrew faith!