2 seedlings from 1 seed transplant?

So I have twins which is interesting; I've had 1 before but it died. My question is: Is it possible to cut down 1 - at 3 days old - and use it as a cutting this early?

And if not, has any1 successfully grown twins?

Yeah, twins will grow fine even in the same pot, but it's a pain and also a recipe for weak weed. You won't be able to clone a seedling... if that is what you are asking.