Visitor Visa - B2

Hi All,
Here is my B2 visa interview experience.
We three sisters(S1,S2,S3) attended the group interview and even we knew English we asked for telugu interpreter as it will be easy to understand questions.
Consulate : Hyderabad
Counter:16
Date:22-09-2017
Status : Rejected

VO: What is the relation between three of you?
me: We both(S1,S2) are own sisters,S3 is our cousin.

VO: What are you doing?(asked this question to S1)
S1: I did my masters, previously worked and as I got engaged took a break from work.

VO: What is purpose of your Visit?
me: We are going to attend our sister's marriage. we planned for 3 weeks vacation,1 week of wedding celebrations and remaining 2 weeks to visit some places in US.

VO: Is she own sister to both of you?(pointed to me and my own sister)
me: No, she is our cousin.

VO:Is she own sister to you?(pointing to our cousin)
S3:No,she is my cousin.

VO: she is not own sister to any of you three?
me: she is our dad's brother's daughter, she is cousin to three of us but same surname.

VO: What are you doing?(pointing to me and my cousin S3)
me & S3: working as so (should match with DS160)and so in so and so company.

VO:Package?
me & S3:so and so amount.(should match DS160)

VO:R u married?
me & S3 :No

VO:Have ever went out of INDIA?
me & S3:No

VO:Typed something in system and given 214B and said "SORRY,AS PER US LAWS WE CANT GIVE YOU VISA FOR THIS TIME"

we think the reason for rejection is as the person getting married in US is NOT OWN sister to any of us and more over we (S2,S3) are unmarried and as he stressed the OWN sister question that is reason for rejection.

over all interview happened for 3 - 4 minutes.
Thank you. hope this will be useful.