Visitor Visa - B2

Hi everyone

My parents got 10-year Visa in first attempt.With immihelp website i did prepare them very well,but we never know,what goes on there.Thank God,my Parents handled the VO questions very well.

The interview went on like this

Dad: GoodAfternoon.
VO: ?
Dad: I am xxx working at xxx,this is my visiting card
VO: looks at dad's card.
VO: Any more papers?
Dad: Yes,Dad gives his leave letter,Cover letter
     Affadavit.
VO: How many children do you have?
Dad: 1 Son,1 Daughter
VO: who is in US?
Dad: Daughter is in US
VO: Is she working?
Dad: No,she is on H4
VO: Is your Son-In-Law working?
Mom: says Yes Sir!!
Dad: gives my husband employer's letter and all our papers
VO: takes a deep look into i-134,employment letter and our xx bank a/c
VO: How old is your son?
Dad: xx years
VO: Is he married
Dad: not married
Dad and Mom: wait in silence
VO: you are approved!!
Dad: Thank you!!
Dad: opened his mouth to ask for 10 year visa,and then boom!!,before he even said it the VO Said
" you are approved for 10 year visa"
Dad: Thank you Sir!!
Mom: Thank you Sir!!
VO: Thank YOu!!

I did prepare them very well,for this interview,and God's grace they did not struggle much in answering the VO.Actually at the end dad felt the VO is a nice jolly fellow,who talked like a guy next door.The point is prepare well and
be natural there.