Regarding gst registration

actualy  i was going to make a new registration of an individual of a proprietorship concern. when filling up principle place of business it asked me whether it is owned or rented? when silecting "ownership" , it asked for legal ownership document/electric bill/ tax paid receipt/municiple khata copy. but the above party has no such document except trade license, fire service license , explossive license. so i asked the above question?

actualy the principle place of business belongs to ------

case 1        his father who is no more and he has four brother.

case 2       his elder brother