I just had the same thing happen in Born Again, except w/ a gender reversal. A freighter pulled in, and I paused the game to size up my newest citizens. One of my new immigrant farmers had a HS education (thanks Immigration Office), so I was getting ready to fire her out of the farm, but when I clicked on her I noticed her household size was 2. What?!?
So I checked, she had married a fisherman (not the one coming in on the boat w/ her, but one already on the island walking down the fishing dock).
It is a good thing they don't have to clear the church for weddings, especially in Born Again (since folks want to go to church 50% more), or my religious satisfaction would really be in the privy.