We’ve all done it. You pop into the supermarket for milk and somehow leave with chocolate, crisps and a “buy one, get one free” you never planned to buy. There's an explanation for that.

One person's diagnosis can help protect brothers, sisters, children and even cousins by prompting earlier screening and potentially life-saving treatment. Today we talk about genetics and hereditary illnesses with a geneticist and with someone who's lived this reality. 

And what role do our earliest relationships play in shaping how we connect with others?