Before reading posts in this thread I thought that etc was earlier than eth which made it classic, actually. I hope no fork awaits us in a couple of days but if it does I guess it's up to websites where people stored money to decide whether they give them other coins or not.
I do not know yet whether BBC and BTC are one owner?
If ETH and ETC have obviously owned one owner, but between the BBC and BTC there is no clear info on this
If you mean two potential currencies which result from bitcoin split than I guess it's obvious that Satoshi is quite responsible for both. Some right on the new coin may belong to those coders who got segwit implemented. And yet it doesn't mean much anyway, for there is no such thing as a currency owner in such a case, I guess.