Yes, there has been an increase in the price for the TIW card. I just purchased my parents a new TIW on our recent trip over the 4th of July. I'll need to renew (they don't actually renew them, you get a new card) mine on our next trip in October. It has really saved our family a bundle!
Unfortunately, they aren't able to split the bill. Now of course, as has been mentioned above, just have your family members pay you their portion of their bill. The credit card or whatever that is being used to pay for the meal does not have to match the name on the TIW card. Any card can be used. So, if your family members have a larger bill than yours, have them pay with their credit card and you can pay them in cash.