Hi Brenda, and welcome to our family.You sound to have a brilliant organised and upbeat attitude to your role as caregiver,and that will surely help in the weeks to come.
Radiation sores can be really bad inside the mouth especially if accompanied by thrush which will show as a white film.A good easy treatment for the sores is salt and soda water mouth washes which you can make up yourself,also plain carbonated water swushed round as often as you like will cut down the radiation gunk.
Good luck to you both and enjoy the friends you will make here.