Well, it has roots in reality. Umrao Jaan is believed to have been based on a real individual, but the story as we know it through different mediums has likely undergone creative alterations and interpretations.
Yes, 'Begum Jaan' is based on a real story. It delves into a particular era and the experiences of the characters during that time, showing the hardships and the spirit of the people involved.
Yes, it is. The movie takes inspiration from real-life events and characters, although it might have some fictional elements added for dramatic effect.
I'm sorry, I'm not familiar with the 'Bibbo Jaan real story'. There might be many stories or characters with this name that are specific to a certain region, community or personal account that I'm not aware of.