Tom, my wife's friend's (Tami's) husband.. I couldn't begin to stand in his shoes if it were my own wife. I'd loose my mind. I'm torn up by this bad enough as it is NOT being my own immediate family.
First, condolences for the circumstances and how it makes you and others affected feel.
Second though, consider that freaking out is exactly what a father cannot afford to do in this situation. Tom's faced with being a single parent raising two daughters, after losing his wife. And what if something happens to him? What if he's unable to work? In the meantime, how will he look after his sick wife, suffering children and work well enough to pay the bills? It's good that they had kids relatively early; that their kids are able to look after themselves for the most part, but beyond that the outlook is not of the life and happiness he would have expected.
He also needs to be very responsible about finances and not go chasing after fantasy cures somewhat scientific and otherwise that thousands are hawking for the right price. I think the standard treatment in Canada for such a case would be chemo, as it would be in the US. If money could buy it; if there was much better treatment leading to cures, Jobs and many others would still be alive, and they would be handing out Nobel prizes.
I suggest, respectfully: Try not to inject more drama into the situation. The family has enough of their own, and it's difficult for them to deal with the emotional trouble of their extended family and friends. Give them peace and optimism if you can, and don't give them feelings of desperation and faint hopes which come at great cost.
I don't like mentioning this, but it would also be responsible for the father to know that children should be screened for similar illnesses, as a rule around 10 years earlier than the age of diagnosis of the parent. We can hope though that of the many people suffering with cancer and its treatments these days, and of the many who live in fear of having a fate similar to their parents or other relatives, that some will live to see better understanding, treatments, and better, earlier detection be developed.