Three generation French coincidence

About 30 years ago my husband and I had a holiday in the south of France with our two children and my parents. Our children played with French children from across the street. Mum and Dad had to leave to drive home before we did. After their departure our daughter had an accident and we were helped by the parents of the two French children. They were also on holiday - from the north of France - and we became friends. At the same time, driving north my parents, who were unaware of this, had a minor accident near Arras. They went to a local garage and, as their car was being repaired, a French gentleman invited them to have a drink. In his house Dad saw a photo and recognised the children and named them to his astonished host. They were the children we had met and the gentleman was their grandfather. We knew nothing of this until we returned home (no mobile phones). We were able to re-make contact via grandfather and the two families have been firm friends since then.