So to give a bit of background, my dad's lifestyle of smoking heavily and drinking led to a throat cancer diagnosis a few months ago. It was very advanced. The only possible treatment was drastic- complete removal of voice box and wind pipe. He now has no voice and breathes through a hole in his neck.
I have known for years that he smoked but he has always been very secretive about it and if it was ever mentioned, he became angry and defensive. What I didn't know was how much he was drinking. He's not a 'get really drunk' alcoholic and he's not abusive (actually he's lovely and gentle and kind). But he does drink every single day, often for a large proportion of the day and it is another thing he has been secretive about. I do know that he drives himself to the pub and back every day. I also know that he came to a family party at our house last year, had three beers and three glasses of wine and then drove him and my mum 200 miles home. I had assumed my teetotal mum was driving.
So this suggests to me that he either a) drinks so much that he has an incredibly high tolerance and probably is safe to drive after that much or b) has lost all sense of judgement about whether he is safe to drive. Either way, he shouldn't be driving at all.
Following his diagnosis and treatment, he stopped smoking and improved his nutrition. I believe he reduced his drinking but he does still drink and if I mention it he will become defensive and angry any then end the conversation. He is an alcoholic and as such, I don't believe he can drink moderately.
Now the problem. I am furious that he drives after drinking but I can't do anything because he immediately cuts off from any conversation about it.
But I need to put my foot down about him ever driving my child anywhere. Dd stays with them for weekend sometimes and they stay with us to help out with dd during my current pregnancy. I have told my mum that this is the rule (she and I have a good relationship and have talked at length about his problems) but I need to make absolutely sure that this rule is enforced. She says she will but it seems like a lot of pressure on her to explain it to him if he questions it. Should I approach it with him, knowing that it will cause a dramatic fall out and a lot of anger from him? Frankly, he can either think I'm being unreasonable and overprotective or he can sit down and think about why his beloved daughter might feel this way about him- I don't care. I just need to know that he will never be driving my child anywhere.
Or should I just make it clear to my mum and trust that she will make sure?