Can I just second everything whitecotton said? Your story really hit close to home for me, having taken care of a father-in-law with dementia and so many of Severus' mental hiccups really resonated. Your writing is so poignant; one minute I would be crying and the next scene had me giggling....exactly like real life relationships exist. I totally felt like a member of their extended family, living out their experiences with them.
Your story will definitely stick with me through the rest of the day. It was fabulous. *fangirls you once more*