This. BTW, I don't think he lives on a boat--why would you fish from land if you lived on a boat? I think he has a modest apartment or house. I also think they live in the US--both speak perfect English, they only use Vietnamese when they fish. Clearly, they have a close bond and this is a "thing" that they enjoy together.
Also, I still can't get past the fact that Laurel wasn't pegged as Randall's mother after her overdose. He was born in 1990--the internet may not have been a thing, but we sure had radio, TV, newspapers. Even if she was brought to a different hospital, it would have been obvious that she had just given birth, and someone would have easily connected that to, "Hey, Mercy Hospital on the other side of the city just had a baby boy dropped off". And wouldn't she have made at least some rudimentary attempt to locate William and her baby? Maternal hormones are insane after giving birth! Even if, say, she was immediately ordered into rehab, she would tell her public defender, "I have a son out there."