What questions should you ask your dad before it's too late?

My father is dying of cancer. I read before about someone recording / taking note of all the questions and answers as a keepsake and figured I'd do the same.
He's not a well man. It's been a slow downhill slope since losing the last of his sight 16 years ago,then diabetes, then heart attack etc. I'm 27m and the eldest of 3. He survived one major operation but it's spread and he's been given 6months-2 years to live - but obviously with Covid going on and him being in crap health in the first place I don't expect him to make it that long. I live abroad (although not very far) and obviously there's a possibility I won't get to see him in person again.
Tbh I'm just rambling here, I don't feel anything yet nor did I when he told me. I just know either way I've got to be strong enough to look after mum. And obviously I don't want to ask him anything too harsh or upsetting to make things harder for him than they already are.
TL;DR: So anyway my questions so far are:

• what would you have asked your father if you could have before he died?
• would you be willing to walk down the aisle?
• is there anything you would have done differently?
• what can I do to best look after mum?
• what do you consider your best qualities?
• what do you consider your worst qualities?
• what would you say to your grandchildren when they're older?
• what could I have done to have been a better son?

Source.