Almost great.
The first 70-90 minutes of 'Follow Me, Boys!' is excellent, it's serious yet amusing. I felt connected to the characters and their storyline. Unfortunately, the film then adds on a pointless if solid extra 40-60 minutes. It kinda feels like one of those TV episodes into one film things, which is annoying as it doesn't need to do it.
Fred MacMurray is terrific as Lem, especially across that opening period. It's heartwarming seeing his character help out a community of kids, particularly one - Whitey, who is played impressively by Kurt Russell. All of the other child actors, while not massively memorable, are fine and you really feel for their overall story.
The final portion of this film really hampers it though. It isn't actually anything bad and if it had been a sequel I reckon I would've liked it, but as a continuation/add-on to the earlier premise it doesn't hit the same heartfelt notes at all. So that's disappointing, but it's still just about a good film.