About your dad's arthritis, this is an old hearth remedy that works really well for mine (yay for being 21 and having arthritis):
Make cinnamon tea -- three cinnamon sticks to every cup of water.
*once the water, in a pan of course, is boiling, throw in the sticks
*reduce heat and simmer for 20 minutes
If he can stand the tast of strong cinnamon, he should drink a cup of this every two to the hours. This helps cut down the inflamation of the joints. If he can't stand the flavor, have him use the hot tea (not hot enough to boil, however) as a hot-pack on his wrist for 15 minutes every two to three hours.
This doesn't work for everyone, but it does help some. It can also be used for other join inflamations AND muscle cramps. (Big wink to all you other ladies out there if you know what I'm hinting at.)