Wow KDU! I'll confess to an audible GASP when I read your plan. Then I thought it through a little more carefully. My sister used to spend summers at my Gran's cottage, and it never caused any ill will - she loved the vacation. It sounds like your mother and your kids adore each other and this could be a great experience. With you so geographically close, you may even get more quality interaction with them than you do cohabitating with teens. Plus everyone gets a break from the emotionally-charged atmosphere.
A gutsy move and a risk. But DBing isn't only about no R talks... it's about making significant changes in the dynamic of your R. And boy, you've proven a willingness to do that.
