Long 'lost' brother

My only brother, now aged 62, followed a successful career as a garden designer and when he married he and his wife bought a farmhouse and made a garden in Northern France. Many years ago he chose to have no communication with our family. I last visited him in France about 23 years ago and have not seen him or heard from him since. In October 2012 I spotted a tiny advert in back of the Sunday Telegraph 'Life' supplement asking for someone to spend an extended stay in St Vincent in the Caribbean to look after house and cats while the owners travelled abroad. Having no commitments to prevent us (parents deceased, children grown up, no grandchildren), we applied and were accepted (all other applicants having eventually dropped out). While there, in Feb/March 2013, we visited an isolated garden, open to visitors, up in the mountains and discovered that the owner was my brother. We were all equally stunned by the elements of chance involved in bringing us together in this one tiny corner of the world and would love to know the probability of such an event. From Jon aged 59, Essex.