Wiktionary
two heads are better than one
prov. Some tasks may be accomplished more easily by two (or more) people working together than by one working alone.
Usage examples of "two heads are better than one".
But if you think two heads are better than one, I'd be happy to hear the facts -- at no extra charge, of course.
You're going to say that two heads are better than one, and that four heads are better than two.