Charlie Sheen and Brooke Mueller Aim For Harmony

The meeting took place at Charlie's Hollywood Hills mansion Sunday -- while Brooke was on a break from her new rehab program.

TMZ spoke with Charlie ... who told us the twins, Bob and Max, had a great time -- playing around and scarfing down handfuls of candy while BOTH of their parents watched. Charlie says, "Harmony is our goal. Sunday was a wonderful start."