HowVeryDareYou2
Asking questions about someone's life is showing an interest. I ask people where they live, if they've got grandchildren, etc., and tell them about my life. It's called conversation, isn't it?
I'd never ask if a person was single or married, had children or grandchildren. They may have chosen not to have children, can't have children, have lost children - same with grandchildren.
Not my business, people will tell me if they want me to know.
However, that is only my approach.
I choose to ask about gardens, the news, and food. Some people choose travel, movies and books. Each to their own.