Are family members supposed to be loyal to each other?

On an episode of friends, ross, screwed up big time with rachel (of course when wasn't he) but, this time, it was pretty big. He had Monica (his sister) put a song on the radio, because he was dedicating it to her. Not that it would help much, but, it does feel nice to have a song dedicated to you. Monica didn't have to turn the radio on though, right? So, why did she

Are family members supposed to be loyal to each other?
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