You have to get with all his Dr's and demand they tell you exactly what their course of tx will be and his prognosis,remember the Drs are working for your dad and he is paying their salaries so DEMAND to be informed.
With my husband we are blessed to have Drs who are straight and honest with us,they told us from the get go that there was no cure and also about the possibility of mets to the brain,but when you hear the initial dx a lot of the info you received is lost just due to the shear shock of the dx.
I would recommend perhaps taking a tape recorder to the Dr appointments,that way you can play the tape back and know exactly what was said.
Do you know what chemo drugs they will be giving?? They gave my hubby etoposide(VP-16) and Cispaltin,he had 9 cycles and did very well with no side effects,I realize everyone is different.
I am like you in that everything happens for a reason and God knows what that is,I believe we need to turn it over to him and let his will be done!
I know it is hard to watch a loved one go thru this,just try and be strong,but also show your emotions and cry if you feel the need it helps a lot,God knows I must be dehydrated by now

Please keep in touch this message board is a great way to talk with others who are going thru the same experiences.
I will continue to pray for your family
God Bless
Karen44