You are fortunate to have them as a resource. Make sure to write down every pearl you get from them, or better yet film them sharing what they know. My sister did that with my grandmother before she passed, recorded her singing old songs and sharing family stories. It's priceless to all of us, and the traditions bring us all closer.
If you ever want any sourdough starter I'd be happy to send some your way.
Cooking on a crazy contraption...