Well traditional cloning is actually just making an identical twin. So if you want a much younger baby brother who's also an identical twin, cloning is all for you.

The other parts people might think of with cloning, rapid aging (adult clones), memory importing that sort of stuff which as far as I know right now is science fiction, maybe we shouldn't do that. However, given a few changed details like if you're using both brains from formation to maturity simultaneously as one brain system, then maybe that's actually fine. Its all very messy, but that's my opinion on the matter.