Visitor Visa for Parents

[Sam_Ali]

Hi,

I am British citizen and I would like to invite my parents to visit me from Iran.

I applied for them through a visitor visa and they have got their appointment next week in Istanbul, Turkey.

I have got a question regarding documents they need to submit.

I filled two separate applications for my mum and dad, also booked two different appointments.
As most of the documents they are submitting are common between them (like their home land registry and bank account and...) do they need to submit a separate copy of each document?

I really appreciate your response and help as I do not have any idea of what will going on in the visitor visa appointment.