Rocks painted in memory of boy found around world

Rocks painted in memory of an eight-year-old boy from Boston have been found in countries around the world. Billy died suddenly in December 2024 - and to help remember him, his family set up Billy's Boulders, a Facebook group which encourages people to leave painted rocks in places they visit. One year later, with more than 5,000 members, they have turned up in places including Australia, Russia, and Brazil. Billy’s mum Jo has been speaking to Grace McGrory.