As much as it could be made fun of as a case of two lovestruck teens getting further in over their heads, Van's proposal to Cheyenne in the pilot is genuinely heartwarming to see, in large part due to how well they end up working as a couple throughout the show's run.
Reba defending Van to his parents, noting that, for as much as she was thrown by the situation of Cheyenne's pregnancy, she's genuinely proud of Van for sticking by his wife and child.
Likewise, Van defending Reba to his father when the latter insults her morality. It even leads to a "The Reason You Suck" Speech, declaring that Reba actually communicated with him about things, whereas Van's father simply bullied him into fulfilling the family's expectations. Van then states that Reba was a better "Dad" to him than his actual father ever was.
Van: Come on, Dad.
Reba: Right behind you, son.
"Well I'm not going to stand here and let my best friend just go and ruin her life!"
"Van, you started out in this family as my son-in-law, and, well, now you're my son."
How about when Reba sings Angel's Lullaby to newborn Elizabeth in the season one finale? If you feel nothing during that scene, you are not human.