Meeting one's non-Muslim mother's boyfriend
Q: I went for a day out with my mum and sister and thought it would be only women but when we went for food, my mums boyfriend came. Have I sinned by meeting with a man I didn't know he was gonna come? I thought it would be just women. My family are non Muslim and I didn't talk to my mums partner except to say hello.
What's the ruling when the following happens?