If a nominated family member can quote the full name of the account holder and their password, that is normally sufficient for third party authority.
Edit: As far as installing goes, the V6 needs two connections.. 1: The incoming co-ax carrying your TV signals, same as any VM box. 2: Either a (reliable) WiFi or (ideally) Ethernet cable to your VM superhub for the internet.
TiVo > V6 swaps can often be done using self-install "Quick Start" with no need for an engineer visit.
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