Debbie.. we're in a similar position. Glen has been asked to participate at UCSF. But with his cognitive involvement, his anxiety level is extremely high. He's very hesitant about the Hickman catheter, and has an added hesitation.. cephtriaxone can potentially be hard on the kidneys, and my father in law died of kidney disease. I don't know your dad's situation, but if high levels of anxiety are among his symptoms, I totally understand your mom's reaction... it's a tough enough thing to live with without doing something that will add to the anxiety.
We also live about 90 minutes from the University, but I'd be more than happy to do it if Glen were so inclined. However, if he's not I'm going to follow his wishes.
Don't know if you've seen the paperwork package that comes with the "invitation" but it has a lot of information on who they're asking, how many, etc. It's definitly interesting reading.