This was a tricky one, not gonna lie, anon! Not for the switcheroo or anything, but just because we haven’t done something like that yet. As it is, Jacob’s timeline is already pushed back a bit to line up with the Winchesters, so it’s not like we couldn’t move him back a bit more to be older than Sammy.

In that case, and assuming we’re talking about a Brothers Adopted scenario with them both tinified, Jacob would be a very patient and chill older brother figure for little Sammy. I can see him quietly listening while Sam goes on and on about what worries him, asking questions, and trying to make sense of the new situation he’s found himself in. Jacob would understand and he’d be a good source of protective hugs when things got overwhelming for the kiddo.

The thing about Jacob is he’s pretty much always a teddy. The difference this time is he’d be older, and the older he gets, the better he is at maintaining his calm. He’d be the most chill.

Unless it called for it. If Sam got captured by a certain giant older brother, that giant might find a little Jacob charging in to try to get him back. We can only hope they’d sort things out before Jacob ended up sticking his nail-sword through Dean’s hand.