We needed a purpose for our visits and for five years, as we made our documentary, it gave us one.We started walking further, doing light strength exercises, and picturing the day Nana, then 88, would finally get into the water and swim.As we progressed with fitness, dementia was taking hold of Nana in other ways.While the disease made her playful, confident to flirt with strangers, and sing and dance with the courage one only dreams of, her executive function was eroding.Nana started to hallucinate Nana lost all fear of the water, and there we were, enjoying it together.Today, at nearly 90, only a few elements of the Nana I grew up with remain.While she doesn't know who I am anymore, her kisses on my forehead and the way her shoulders bounce up and down when she laughs still take me back to the Nana who fiercely protected us growing up.She now cries for her mum and tells me she is scared