In ANH, Lucas is often able to create character depth with minimal exposition, just having them say a few quick sentences or a glance or whatever often explains who they are and how they feel about things in the film. But this can sometimes lead to alternate interpretations of a character's motivations or feelings, such as with Ep I where the script suggests Watto's character is routinely physically abusive to Anakin by having Anakin flinch when Watto first says something to him -- this element made it to the screen in a very small way, but it didn't really show through that hard, I missed it entirely on my first few viewings and thought that Watto was somewhat friendly with Anakin considering the relationship (I still do even after I read the script because of how I first interpretted it in the film).
I bring that up because in ANH, Owen Lars isn't given a lot of screentime, and most of what he is given doesn't seem to be all that nice to Luke, yet he still comes off as a father figure who is grumpy but genuinely cares about his nephew and imbues similar feelings in the boy. But it could be interpretted that Owen is a selfish, crotchety old man who is holding Luke back simply for the cheap labor - it's highly unlikely to be sure, but not impossible. So, my question is, does Owen love and care about his nephew or not, and is there enough on-screen evidence to support either conclusion?