Double Knitting Increases

How do I increase when doing double knitting. I am making mittens. If I increase at the sides with each color, then I have 2 sts of each color…is that right???
It doesn’t look right plus on the next increase row I would have 3 sts of each color:??

Welcome to Knitting Help!

I’ve never done it, but I found this.
http://www.stitchdiva.com/custom.aspx?id=149