Hi
@Tootybanooty . . .
I feel for your situation . . .
So much of family life is specific to the personalities involved, their interactions and their history. It's difficult for any responders here to zone in on THE piece of advice which is really helpful, because we can't know these details. I hope you get plenty of different suggestions, and some among them are helpful for you.
From me . . .
I can easily talk about Hypos with my girlfriend, but I cannot easily talk about them with my Mum. I know that they both care for me very much and have my best interests at heart, but I have a totally different feeling when talking to one or the other. When talking to my girlfriend I have a nice feeling that she truly understands my point of view. I love this, and am happy to have the chat. When talking to my Mum I have an awful feeling that what she sees through her eyes is a 9-year old boy who cannot take care of himself. I hate this, and will always avoid the chat. (I'm 43).
From your Post, it sounds like you have never been able to find the right person or the right way to talk with your Dad about the topic? (if there is one, at all). It may be worth asking him, baldly, if the way that you talk with him is annoying to him? or if there is another style or another person that he would prefer?
It's just my opinion, of course, others will advise differently. But when I read your Post I feel like understanding WHY he does not talk (or gets defensive) about the Hypos is the most important thing. It might be that you can directly ask - how can I/somebody talk about this in a way that is OK for you?
By the way, I can totally relate to your statement about loss of routine. Routine is crucial to my management of T1. I'm a freelancer, and in those times when I'm not working my management is much more difficult. An unplanned/unstructured day leads to spontaneous decisions which are nearly always not wise for my T1. I find it's also to do with self-esteem - I feel more useful and in control of my life when I have tasks (paid or unpaid) and people or processes are relying on me. I will automatically take more care of myself in that situation; a matter of pride. Even if you don't find a solution to the communication problem, such a change might be helpful, if he is willing and circumstances allow.
Best Wishes & Regards
Antony