I have been on a gluten-free diet for 22 years but only recently realized the dangers of cross contamination. I have my own toaster now, my own pans for cooking. I have gotten rid of all the wooden spoons and plastic spoons and teflon pans which could have contamination.
As far a baking there was a mixture of rice flours on this site a couple of days ago I believe from Connie. You use equal parts asian flour (fine) glutenous flour, and a regular rice flour and substitute that mix for flour in your cookies etc. I did it yesterday for toll house chocolate chip cookies and I took them to a BD party for my niece and no one knew they were gluten-free until I told them. You can purchase the asian rice flour and the glutenous flour at an Asian Market and the cost is much more reasonable then at the health food stores.
You must be very careful using the same mayo, peanut butter etc, as your other family members may have used those products and contaminated them. I really didn't think this was possible until I was having problems and when they tested my blood it showed an elevation of gluten levels. Since I have been more careful they have dropped below 20.
I hope this helps a little, I am sure more people will give you suggestions to help you. Hang in there.