Visitor Visa - B2

hi friends...my father went for visitor visa 3 times before..all the times he got rejected as potential immigrant..finally we tried 4th time and he got 10 yr multiple visa..this time the consular didnt ask him much questions just where is ur daughter,when did she come to USA..whats ur son in law profession and other normal questions...as my father went with telugu translator..he could answer them very well...finally the consular asked him to pay fees..after coming back my father said he was just cool this this time..and answered with confidence..i just want to share with you guys this..because i almost lost hope after 3rd attempt..but my father's stubbornness and my husband patience made it possible now..
     just guys dont lose hope..try again and again...sure u will succeed in getting visa ..as we know there is no particular norms for getting visa..