How about taking pictures outdoors, or birdwatching and then identifying the birds. Can he help with vacuuming or something? What if you put a jigsaw puzzle right in front of him, would he work on it? Audio books? Pulling weeds? Clean out the garage or basement or sweep the floors. Models of planes or maybe dinosaurs for grandchildren? You can buy kits to build birdhouses and then paint them. Or set up an easel and paper and he could paint? If he can remember the past he could write his life's story for family. If the "executive" function of his brain has been damaged he won't have the impetus to get up and do things so you have to get him started because he can't get himself started. Turn on a movie and maybe he'll watch it. Don't wait for him to make a choice - make it for him. Can the two of you go to the park or something? Or Zoo? Can he pull weeds? I've found that if I ask my husband to do something for me, he usually will, like feed the dog. And if a time deadline is associated with the task, so much the better. Can he start the coffee in the morning? If he takes naps, have him do something then he can nap. Maybe get up, make coffee, eat breakfast, watch news and let you know what is going on in the world, then do an activity, lunch and then a nap, then maybe help you with housework or yard work or do another activity, watch news before dinner, help you make dinner or visit with you while you make it, eat dinner, go for a walk, watch some TV, go to bed. Or something like that. If you have a dog it could be his job to play outside with the dog. Just blurting out some things that came to mind. You have to take the lead and get him started. Best of luck.