Well, both of you could benefit from the hand-eze gloves. They reduce weariness in the hands because they massage as you wear them while you're working your fingers (knitting, writing, typing, etc.). Also, there's needles out there that's better for people with diseases that affect the hands. These are mainly made out of materials that have some give and are easier on the hands than metal needles. Bamboo is one of the materials... I think there's a specific plastic.... I believe it's casein, a plastic discovered in the late 1800's. It's made from skimming milk or something like that and doesn't have any carcinogenic materials in it, etc. has a good give in the flexibility of the needle but is rigid enough to be able to knit with it.
That lists several things you can do to help reduce the stress on your hands, as well. Read it and do it. There's probably more things out there but these are the main, basic things that will help with this. Trust me, I have RA and I know I feel better while knitting wool and any time a project that's larger than socks or mittens gets to rest on my lap instead of pulling down on my hands and wrists, my hands last longer. I also find that the wood and bamboo needles are easier on my hands than the metal ones... though I'd like to try the casein ones... I really would. They'd probably be similar to the wood, I'd think. If you don't have circulars or enough of a stash of them to have mostly anything to make anything with, you should try the kits of needles, like the Denise interchangeable knitting needles. I love mine! Mine are old, though... someone gave them to me and one size is missing but the rest are there! The little case has I think four flexible... string-like plastic things that you can put into needle ends and stopper ends. There's several stopper ends and a good range of sizes of needle ends. You can either make them into straight needles by putting a stopper on one end and a needle on the other or you can make circulars by putting both ends needles. It's worth the cash to buy one of those and they're not as bad on my hands as the metal needles, as well. I think they're just regular plastic, though but regular plastic has some give, as well.