How sad to read that, dementia is one of the cruelest diseases I know. I hope you haven't suffered too much! And I'm terrible at giving my condolences, so I'm sorry, if i could i would just give you a hug and remain silent.
Ballroom may be kind of boring tho hahahahaha maybe is not your type of dance. I laugh too much with your last paragraph hahahahah I can´t with you.