User blog comment:KidLego09/Could Rodney and Scott Be Brothers?/@comment-31556666-20150114101421

I don't really see them living on a country or farm is something that makes them brothers. Beth is from a farm. She related to Scott? Of course not.

Cousins seems way more likely given what's mentioned below. Rodney could also be the reason Scott is annoyed by incredibly happy people because Rodney possibly gets on his nerves with his neediness the whole time. That's probably why Scott hates someone like Sam for example.