There are a bunch of guides on YouTube. I will say on my recent family shoot that it’s good to feel a connection and like yourself with the least amount of tension as possible. Get what you can with guidance and personality. Your client definitely feels you and you want to make a day out of it in a sense. Even if it’s only a half hour. Interact but be personable.

Edit: Sorry I sound so cut and dry. This idea has done wonders for me though in tricky situations.