How did Bachchan family catch Coronavirus?

Both Amitabh Bachchan and Abhishek Bachchan have tested positive for Coronavirus (Covid-19). However, it is still unknown how the two actors contracted the virus. One theory is that Abhishek Bachchan had visited a studio in Versova for dubbing on 8 July and could have caught the virus then. The other theory is that Bachchan's family residence 'Jalsa' is in Andheri which is already a Covid-19 hotspot. Hence, the Bachchans might have caught it from the locality.