Sponsor's address history

[Magay]

Hello..Im just confused and dunno what to write down in address history of my hubby(sponsor) According to him he worked on a camp for 2 months and stayed there at the same time.But he used his father's address for mailing purposes like his Tax .HE doesnt know the address of the camp.Im confused what should i write on his address in the year 2014-02 to 2014-04.?Is it his father 's address or the camp or leave it blank.If ever I leave it blank does it affect our application and return it to us?Thanks