yes, your sentence makes sense,
go for it.

What about:
You are not the only one who is dad. :)))

But may be Mr. Shoval is quite right:
There is one who is dead.
He or she ist the only one who is dead.
Conclusion:
You are not
the only one
who is dead.

In other words: You are still alive! :)

Remains the question: is this a sentence used in real life?

And should we collect as much "strange sentences" as possible, or should we focus on practical useful sentences, even if this will be difficult to define, but I'm speaking about what tendency we should follow (if there should be something like an orientation at all).

It's like talking to a dead body, same as this one:
"If you have to shoot - shoot, don't talk".
Eli Wallach talks to a corps.

I believe it may be strange, yet acceptable.

re: should we collect as much "strange sentences"
it seems like a wall issue...

+ "You're not the only one who is <adjective>" is a very useful pattern. <adjective> = "dead" is fun and (even better) memorable.