visitor visa documents

[vemula]

I am the sponsor for my mother in law for visitors visa.
1)Do i need to send all the documents through post or i can send scanned copies?
2)i booked a date for visa interview to my MIL.
can i add my father's at the same time in group option.Both of them can attend the inteview together?

[immihelp]

1. Post. Need original.
2. No, not at later point like this.