Hi, my heart goes out to you. I know what you are going through. I am a caregiver for my father who requires 24/hour care and has been on Hospice for 2 years. He is not fed through a feeding tube, but all of his food must be pureed. Additionally, I have studied nutrition because I was diagnosed with cancer in 2000. Through a series of events, we decided to pursue treatment through a natural means i.e. diet. I never received any medical treatment and am still alive and healthy today.
Having said that, please understand my idea of a balanced diet may be a bit different than the standard American. Because of the chemicals, pesticides, GMO, antibiotics, and hormones in our diets, we are suffering many diseases that our ancestors didn't. I would recommend a vegan and gluten-free diet. This is the way I eat and the way I feed my father. I have a food pyramid that accounts for a vegan diet. But, should you want to keep animal products in your child's diet, I could create a meal plan using the standard pyramid as well.
I decided to try some freelance work to supplement our income. I will be happy to assist you anyway I can.