score:4
I personally haven't had experience with this but as per the UK standard visitor visa documents guide provided on this link :
https://www.gov.uk/government/publications/visitor-visa-guide-to-supporting-documents/guide-to-supporting-documents-visiting-the-uk
You do not need to provide multiple copies of the same documents if youβre applying as a family or group at the same time.
but recently one of my acquaintances applied for a standard visitor visa for his parents from India, and just to be on the safe side, he added all the documents of his father's (FD, Assets, Bank Statements) with his mother's application as well. Maybe others with more experience can shed some light on this.