What a pointless point to make. I’ll spell it out for you: related within a generation or two. There are no twins in my family that I know of for several generations, for example. Thus I would say I’m not related to any twins because I’m not in any meaningful way, even if there might be twins somewhere in my ancestral history.

If you mean that all humans are related, that is true but a completely useless fact in this context.

Not every word in a conversation needs to be useful.