"How much one enjoys himself travelling depends largely on who he goes with, whether his friends or relatives."
Can someone paraphrase this sentence? I am confused about "whether his friends or relatives".
This is my best interpretation:
"The amount of enjoyment one derives from travel depends, for the most part, on one's travel companions, regardless of whether these are one's friends or relatives."
However, I would never use "whether" in this way. It's confusing because it's not clear whether it's meant to restrict the company to friends and family as a condition for enjoyment, or whether it admits their presence as a last resort, and means "despite" them.
See this conversation. I have tried to simplify the sentence in concern.
How much do you enjoy traveling? ~ It depends.
What do you mean?
I mean it depends. If I'm with my friends, I enjoy it more. If I'm with my relatives, I don't enjoy myself that much!
Whether his friends or relatives introduces two options he goes with. And, depending largely on that, he would enjoy himself more or less while travelling.