I'm so sorry for your loss. My prayers go out to you and your family. I'm glad he had you and your mom. It's obvious he was loved.
Memories live forever, not even ALS can take them from you. You'll have them to cherish forever. I didn't lose my daddy to ALS, but still lost him, but his memory lives on and he lives on in my heart for being the wonderful man he was, as your beloved father will.