Davetucson I found that scene but it's in spanish
Love the original English voices
This is the translation
A: Do you like being called mr. Ingalls?
C: I never thought about it. It`s my name.
A: Well everybody doesn`t call you that.
C: No, no, some folks call me Charles, some just Ingalls. In the city most of the time they say 'hee you'. (laughs)
A: See, the reason I was wondering is, well, that at school they ask me how I call you. And mr. Ingalls sounds sort of stuffy.
C: O, you can call me Charles.
A: No, I`m just a kid that wouldn`t be right.
C: Let`s see, what about uncle Charles?
A: Nooo, when I was in the orphanage this big kid Raymond used to grab my arms and put his foot in my stomach and pull until I said 'uncle'.
C: (laughs): I`m not blaming you for not liking that one.
A: You know, it might make things easyer, for the kids in town and all, if I called you 'pa'.
(short silence, music starts)
C: Is that all. I... I thought you gonna think up something hard I have to spell or something.
A: Than it`s alright?
C: It`s fine with me
(close-up Alberts face)
A: (smiles) Thanks mister Ingalls. (wispers) I mean....pa...
(short silence, they look at each other, smiling)
C: Now try to get some sleep.
A: (sigh) I might close my eyes just for a little bit.
He lays his head on pa`s chest. Pa hugs him a little, smiles and is close to tears.