This is just the kind of thing my father did with us (He taught maths and physics - the maths didn't rub off on me, but some of the demonstrations did) My father was a mathematician,my brother studied maths, my husband physics, and two of my three children science. I have spent many Sunday afternoons listening to them (or a subset of them) earnestly discussing the origins of rainbows, with diagrams, or making "static boxes" with a clear cover, containing bits of confetti-like stuff that danced when you rubbed the cover. When I said that I wished my spinning wheel had an attachment for winding wool, powered by the treadle, a consortium of three of them designed me a beautiful one. No-one actually made me one, of course, they had moved on by then.
Never a dull moment!