@TNT261 Yeah, I actually do agree with you that that's the point he was likely making. However, we have no idea if their teacher from nursery school or friend from the sandpit were actually people who changed their lives forever. Maybe they actually were. That's still completely possible, and yet they're still forgotten.
Like, I get it. He is going to be a part of the lives of the children going forward, and that makes it much less likely that he'd be forgotten. However, in real life, he could just stop visiting for whatever reason. Sounds like he hadn't visited the parents for a while before the start of this series since the daughter didn't already know him already.
I'm not trying to make this a big deal. Just writing my thoughts on it.