Sorry to hear of your family problems, dgramie. I hope things get a little easier for you.
What did you mean by the food was pop? Is that good or bad?
I am not one for prayer, but I do hope your sister's situation improves. It is good that you are thinking of your own health too.
As a person with a LOT of current family problems, I empathise, however I have learned that I have to concentrate and be slightly selfish to put my own issues at the forefront too. Being healthy is a constant battle and something that effects everything around us. I am not half as useful to my family as I could be and a lot of that comes down to my size and mobility issues,
Being obese is easy... changing it is what takes the work.