I know the feeling of helping some one with Alzheimer's diseases. My grandmother is in the end stages and it truly is heartbreaking to see how the brain shrinks... even up to 30% in the end stages. I wish your father and wife all the best. I served two and half years in the Canadian Military until I tore my ACL. I know the burdens of military life but also its greatest accomplishments.
I hope to see you back in space some day, perhaps we can share a few stories as well.