Note: "In the mid-1990s, Adam Gadahn moved to his grandparents' home in Santa Ana. He found Islam on the Internet, converted at a mosque in Garden Grove and leaders there say he fell in with a group of Islamic fundamentalists."
It was while living with his grandpa ( who I assume grew up in an Islamic country before moving here in 1949 ) that he "found" Islam
Wait a minute: father named "Pearlman", son named Gadahn?