and buy only kosher food (we do not have kosher dishes). “
How wonderful that you are taking even the “baby steps.” Each step is worth the effort. Is it possible in your household for you to cook your own food with separate pots and utensils, and serve it with disposable silverware and paper goods? If you already have kosher food available, it’s not so big a leap to using kosher utensils for yourself, so maybe your family would get on the bandwagon with you. If not, speak to a Rov as to how you could use your oven in a kosher way (i.e. double wrapping your pans first), whether that would be permissible to you, given your circumstance. Or perhaps you could get yourself two inexpensive toaster ovens one each for dairy and meat. In either case, don’t give up. You are motivated, and it is praiseworthy of you.