Prayers are with you and your son. Our lives were written before we were born. It's all is God's plan. You nor your son is to blame. I pray the Lord take this sense of guilt from you and your son and replace them with loving memories of your Mother. I'm sure she wouldn't want neither of you to feeling this way. My Mother to has MS and I pray for her and love on her as much as possible. I know the many changes the patients go through. Praying for you and your entire family during this difficult time. So sorry for you all's loss.