Who does "Pharaoh's folk" (Āl Firʿawn) refer to?

Imām Ibn al-Jawzī (d. 597/1201) summarized the scholars' opinions in his book "Zād al-Masīr" as follows:

1. The people of Egypt. [Muqātil]
2. Specifically the Pharaoh's household. [Abū ʿUbaydah]
3. Those who followed his religion. [Al-Zajjāj]