Mutual friend coincidence

I was making polite conversation with a male co-worker from the large London open plan office we both work in whilst the kettle boiled in the shared kitchen where I work. Gazing out of the window at the sunny day we remarked how glorious it was and that it was only going to get better over the weekend. I mentioned I was going to Strasbourg the next day. ‘That’s funny’ the man said, ‘my mother is also going to Strasbourg tomorrow’. He added that his mother was going to a wedding to which I remarked "I'm going to a wedding too - isn't that strange?" ‘Are you going to Paul Wilson’s wedding?’ he asked. I was stunned, I am Paul Wilson’s stepmother and his mother was Paul Wilson’s mother’s best friend and he had known Paul for much of his childhood.