Why did Bhan Singh break down in tears?
To answer the above question, I will have to bring up the history of Bhan Singh's city, namely Mirpur Khas.
As the name suggests, Mirpur Khas was 'the special town of Mirs' in the old days. After the Partition, people who migrated to Mirpur Khas from India would be very particular about appending 'Sindh' to Mirpur Khas whenever they wrote to their relatives back in India and within Pakistan, emphasising that they lived in 'Mirpur Khas, Sindh'.
Similarly, people who migrated to Hyderabad would call their new home 'Hyderabad, Sindh'. This was an attempt on their part to prevent confusion as a town named Mirpur is located in Azad Kashmir, and a Hyderabad in India. They were afraid that their mail would be sent to Azad Kashmir's Mirpur or India's Hyderabad. This was not very likely but they still played it safe.
In Mirpur Khas, Bhan Singh — a Sikh resident — built a haveli (mansion) and a baithak (guesthouse), which was no less than a sprawling bungalow. In the backyard of the baithak, stood a stable. Since he owned the entire estate surrounding his haveli and baithak, locals would refer to these quarters of Mirpur Khas as 'Bhan Singh Abad', which roughly translates into 'the town of Bhan Singh'.
There was a very small Sikh population in Mirpur Khas before the Partition but large enough to want to build their own place of worship here — a Gurudwara — in downtown Mirpur Khas.
It still exists, though, it now houses the local offices of Jamaat-e-Islami and the Evacuee Trust Property Board (ETPB). A plaque on the facade of the Gurudwara has a few words inscribed in Gurmukhi script.