It's true. Taking the 'high road' is just basically being a doormat, and gets you walked on. I developed a personal policy to take the low road every time. It has dramatically reduced the amount of crap that I have to deal with.
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I learned during my years with that family that it's best not to ask questions regarding their choices and possessions. Anytime I was so foolish as to ask 'Anybody wanna claim this rock on the kitchen table or can I toss it?' well suddenly cleaning was canceled because the kitchen was full of an extremely serious discussion regarding ownership of that particular rock. The rock could not be moved because its position might be a clue as to identification of the owner.