The other thing he can do is if the tablet or capsule is scored in the middle, he can split it in 2, and take one
half in the morning with breakfast, and the other
half after dinner. Its important to drink a full glass of water with your medication also.
How old is your Dad? Sometimes, its more mental than physical. Older people are just so down about having CML, and they just do not care.
Keep him moving and doing things no matter what his age is.