He may just need time. Just let him know you love and want to support him and you don't want him to worry about you.
You see, for those of us who have stage IV we worry about our family members and how they will feel or take things. We have to be ready to deal with that once we tell you. Nobody can help feeling it is about them because that is how we see the world...through our own eyes.
I try to be supportive for my wife and daughter and son because for them, while it about me, it is also about them.
Give him time but be sure he gets your message of support. Then stick by it. If he tells you something, don't say, "oh no, what about me? "
Not that you would ever say that but sometimes people behave that way even if they don't say it.
Could be a million reasons that only he would know but could be he just isn't ready yet. Sorry I am babbling. I'm hooked up to my chemo right now and getting really tired but I wanted to check in here at the site.
Good luck to you and your dad!
As was said, let him know there are people here who have been there, done that.
My history is below.
Mike
Age 54
10/31/06 dx CIS (TisG3) non-invasive (at 47)
9/19/08 TURB/TUIP dx Invasive T2G3
10/8/08 RC neobladder(at 49)
2/15/13 T4G3N3M1 distant metastases(at 53)
9/2013 finished chemo -cancer free again
1/2014 ct scan results....distant mets
2/2014 ct result...spread to liver, kidneys, and lymph...