My mother in law also has inoperable panacreatic cancer. She, too was on Gemzar & Tarceva. To give the Gemzar, there has to be a certain level of health. At each chemo appointment, blood work is done to determine whether or not the patient is well enough to administer the drugs. White blood cell counts, hemoglobin levels and iron levels are just some of the things that are monitored. If you ask at the next oncology appointment or chemo treatment, I'm sure you can find out your father's test results are. The nurses & staff should be able to explain to you what results are most important and what things might need to be followed up on or treated. (Yes, there are shots that they can administer to your dad for certain deficiences, but it still won't mean that they will give him his Gemzar that day.)
Your father will also need to be well enough to have the port line installed. My mother in law had it done and considers it to be a godsend! It will make adminstering chemo much easier. If your dad needs hydration, he can also get it through his port line. When my mother in law was admitted to the hospital for a liver abscess, most meds were given through the port line.
A word of advice: we've been struggling through this for almost a year now. My mother in law lives with us now and I'm providing most of her care. My mother in law cannot safely be left alone at this point as she is terribly weak & not very lucid. I have children & a job, but I'm glued to my house. My sister in law brings her young kids and visits just about every weekend- an additional strain on my family and resources. I am under a tremendous amount of stress. My husband is following his sister's wishes and is holding off hospice care. The delay of hospice is keeping help away from my mother in law, but it is also straining my marriage and who knows how much pain this is all causing my kids. If the subject of hospice is ever brought up, please don't hold out! Whoever is caring for your father is likely wilting under the pressure. If you can help relieve the burden of care in any small way, please do! Even something small is a huge help. Good luck!