And Pharaoh rose up in the night, he, and all his servants, and all the Egyptians; and there was a great cry in Egypt; for there was not a house where there was not one dead.
All Commentaries on Exodus 12:30 Go To Exodus 12
George Leo Haydock
AD 1849
Pharao, who it seems was not the eldest son. Where the first-born of a family had a son, both were consigned to destruction. (Menochius)