You never stop caring for someone you love, whether or not you're the primary physical carer. When someone can't speak for themselves, defend themselves or stand up for themselves, they are completely and totally vulnerable. No matter how much 'help' you get, your the one who will protect them unconditionally in all aspects of life.
It is challenging; physically, mentally and emotionally. A roller coaster ride of joy, sorrow, guilt, hope, anger, compassion, frustration, fear, depression and elation, just to name a few. But you never stop loving and you never stop caring. They only have you.