Add a feature for discussing feedback with beta-readers

tl;dr What are good questions to ask and good questions to avoid with beta-readers? Is it good to talk in group or better one-on-one? A year ago my father read some of my writing and we discussed it via a list of questions I had found somewhere on the internet. I don't remember the questions but I remember it was a bit overwhelming for him. Not the reading part but answering the list of questions. It has made me think that perhaps I should adjust how I go about discussing feedback for my next project, especially when the beta-readers are just friends and not writers (so they might not actively think of storytelling principles in their feedback). I was also thinking that if my friends are nice enough to give feedback that I want to say thank you and treat them to a dinner party, or something, after the feedback session. But then I am thinking that if everyone is giving feedback in front of each other that it might affect them to give feedback based on what is said by group rather than individual thoughts, OR, it might benefit them all to show how they agree or disagree or feedback topics and give everything more nuance. For this of you with experience on this, how do I best go about discussing feedback with people that only read books (and never write themselves)? And how do I best go about discussing feedback from a group?