Who is the rightful Russian czar now? Could there be one?

Factual Questions
1

So, I’m told that the russian czar and his immediate family were executed in 1917 or thereabouts. My question is simply whether there could be a person living today who could legitimately claim the title of czar.

I’m not saying this is a good or bad thing. It just seems to me, that if Nicholas II and his immediate family aren’t available, one could move to his siblings, or even back a generation or two, until finally finding a way to trace forward to the present.

Has anyone ever tried this?

2

The position of Czar no longer exists in Russia, so even if a descendant wanted to claim the title, there is no title to claim.

3

The whole sad tale was unreeled in this thread:
http://boards.straightdope.com/sdmb/showthread.php?s=&threadid=154021