A beautiful way to preserve the essence of your grandfather is to write- journal your memories of him, your laughter, the lessons he taught you. The smiles and the funnies and the things that just you two have shared. His memories may be faltering, but you can help keep them safe while he is unable to keep for himself.
Have patience and understand that it is far more difficult for us to see those we love drift away, than for those experiencing. Offer soft hugs and kisses when he does not understand-for the gift of affection is universal.
Love and peace to you, Susan.