We entered the United States from Quebec to activate our green cards. There were three of us, but only my son's photo was taken. We and my wife were not taken, and all three of us did not have our fingerprints taken. I asked the officer at that time if I needed to take fingerprints? He smiled and said, do you want to take fingerprints? I'll record it for you. I smiled and said, no need. Later, we received our green cards smoothly.
Just for your reference, wish you good luck