I am a British National and my sister has come on a visitor visa to visit me from India. My Nephew(my sister's son) has received his study visa from a Canadian university, he has an indian passport. He want's to visit and stay with us for a week first and then travel to Canada from UK. Is there a concept of extended transit visitor visa for UK?
As per https://www.gov.uk/transit-visa/visitor-in-transit-visa the max allocated time in UK is 48 hrs, so I think he won't be eligible for this one as he want's to stay for a week.
If he cannot get a transit visa does he need to apply for a family visitor visa separately? In that case would their be any issue as my sister is already on a visitor visa?