Jess whatever else you do dont argue with your Dad.
At times like these it is difficult to remember how the parent /child relatonship is supposed to work,and angry,frustated,scared as you are he is still the parent in the relationship.

Nobody wants to die.Robin didnt want to die.But when faced with the inevitable he dealt with it,and in the end he chose how he died.

That is a choice every one has a right to make,and wether you agree with it or not ,like Pauls Mother it is a choice he has a right to make for himself.
Dont argue honey get some counselling and deal with his decision,then help him to see it through.
Your job is going to be to support and help him,not censure and criticise how he chooses to live out his remaining years.

Anger against your Fathers wishes is perfectly natural and will continue to be a problem throughout whatever choice he makes,but dont let this feeling destroy whatever days,months and hopefully years that he has left.

Caring for someone you love who chooses to undergo aggressive and radical treatment for mouth cancer is not easy either,and can leave you with memories that may haunt you forever,so dont think it is just so simple as agreeing to be treated.You could become so distressed with all the affects of the treatment on him that you wish you had never made him have it.

Its a hard one for sure,but say your piece then leave it for a while,and let him digest the information.If he still chooses to do it his way,respect him and support him.

love liz