Hi sorry to hear about your situation I'm going through similar one with my dad I'm the only child and I can sort of understand what you mean it's hard .I've been going through bit since April and it does get a bit easier to deal with but I still have a few good cries on my own to cope with it .you can't get rid of your emotions it's what makes you human ,I try and get out as often as I can to go for a drive orca walk or do a job for a friend it brings some normality back to your life ,but my parents do rely on me I stay strong in front of them but have a meltdown on my own I think it's all you can do I don't if it's any help but I don't think your alone in feeling this way I look back at how I was when he was diagnosed and try to look how far me and my parents have come it helps me hope this of some help