Parents and Sister B2 Visa rejected

[piyajava]

Hi, Urgent help required!!
My parents and sister had family interview at Delhi on 11th May

VO: What your son is doing in USA?
Father replied: [in confusion] MS in computer science and my mom added he is on OPT.
VO: What is your salary?
Ans: Father said 3 lac
VO said: Monthly or yearly?
Father : Monthly, 25000.
VO : Which company you work for?
Father : XYZ company
VO asked my sister : What you do?
Sister : I am a student
VO : where?
Sister: City name,State
VO:Can you tell ur Course and College?
Sister replied correctly.
VO: sorry we cant give you visa.
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Now what i think the reason of denial :
1 My father salary and in DS 160 I put him as whole sponsor.
2 My father got confused instead of saying my son is on OPT he said he is doing MS .

Currently I am on F1 OPT at reputed company and I invited them to my graduation ceremony but VO didn't asked anything about my graduation ceremony or about my company. (Very disappointed). Please guide what things I should add now and to take care. When should I can reapply.

[immihelp]

Read https://www.immihelp.com/usa-visa-re...lication-tips/