Black Ink works with all graphics tablets, and when somebody meets a problem it's corrected soon as possible.
For the choice of the drawing tablet it all depends of the time that your father spends on drawing, his skills and your budget
I know there is other constructors as Genius
, ...but I have tried only Wacoms.
In overall feeling I prefer Intuos pro (A5 format), and for a better control when you are drawing a Cintiq (12"HD).
I have tried low budget graphic tablets too, maybe I am very demanding, but I don't like the feel of it.
I hope my answer will be helpful.