Visitor Visa - B2

I booked appointment for me and mom for B2 visa to attend my elder brother's wedding which is 2 weeks before of his graduation ceremony (my brother changed the University after going to USA)
my mom she can't speak English so interview was on Urdu.

VO: can both of you speak English ?
Me: No, I can but she can't.

VO: Sir please wait for some time ? (he called one lady to speak with my mom)

Interpreter: (to my mom in Urdu) why do you want to go USA ?
Mom: to attend my son's graduation ceremony and his wedding ( she replied to VO after keeping on mute then VO told to aks other question )

Interpreter: who is he with you ? (pointing towards me)
Mom: My son (again she did the same then VO asked other question)

Interpreter: how many kids you have ?
Mom: 4 sons

Interpreter: where are other 2 ?
Mom: 1st is a Software developer 2nd in USA 3rd is with me and 4th is doing MBA.

Interpreter: is your husband alive ?
Mom: Yes

Interpreter: is he out of India ?
Mom:

Interpreter: then where is he and what he is doing ?
Mom: he is not working because he is on bed rest from 2 years ( I was looking at the Interpreter she was not translating properly to VO, she was translating only in 1 word to VO her husband do “Nothing" she didn’t told him that my father is on bed rest from 2 years. as my said

Interpreter: then who runs your home ?
Mom: my 1st son as he is working from 7 years in software filed and my 3rd son who is here, both on them are working.

Interpreter: what your son is doing in USA ?
Mom: Master.

Interpreter: Is he working ?
Mom: No

Interpreter: from how long he is USA ?
Mom: 3 years

Interpreter: Which university ?
Mom : University of Cumberland. ( which is in Kentucky but on visa it's Trine University )

Interpreter: where do he live ?
Mom: Chicago Villa park

Interpreter: do you have his passport and visa copy ?
me: Handed over my brother’s passport and visa copy to VO.

Then VO checked something on system for few second after typing my brother's visa code number which I was looking at him only, after few second suddenly he handed 214B form to my mom.
didn't even asked a single question to me not even looked at me he ended the interview
i told to Interpreter that we have his transcripts and all other documents then she said "Interview khatam ho chuka hai aap log visa ke liye eligible nahi hai SORRY"

can any one let me know what went wrong as I'm working from 2 years in MNC I carried all the documents my offer letter, ID card, Payslips, Bank statement with 7 lacs but VO didn't ask a single question to me.
if I don't get the visa doesn't matter but my mom wants to go bcuz of my brother's wedding
should I send only to mom for interview now or should both of us try or there is no possibility of getting the visa bcuz my brother changed the university and it's been 3 and half years he is in USA and didn't completed his masters.
I think we shouldn't tell that my father is not working
please need your suggestions people ..........!