Standard Visit Visa - India Retired Parents

[Smurf786]

Hi Guys,

Thinking of calling my wife's parents and her uncle and auntie on a standard visiting visa from India.

Her dad is working, has his own house and own shop.
Her mum is a housewife and not working.

Her uncle is retired, has his own house.
Her auntie is a housewife too and not working.

Her parents will be sponsored by me and uncle auntie by her daughter who is also a UK citizen.

Wish to call them on 6 month standard visit visa. What are the options? What documents are required? Do they need a certain amount in bank accounts each?

Thank you for your assistance.