I know someone who had a guest staying over at their home on census night. Not a tenant, not a life partner, not a family friend, just a guest. Apparently the questions the census asked about them were the same as if they were your wife or personal relative. Questions that are wildly inappropriate and invasive to ask your guest.
- What's your income, exactly?
- What's your gender? And also birth sex?
- Are you gay? Straight?
- Where do you work? Specifically, street address? How do you get there? How many hours per week?
- Where were your parents born?
- Where were you 5 years ago on this date?
- Etc
There was no way to just send a link so they can fill in their section privately online. Seems like an obvious feature to add. You have to just give them your device unlocked and hang around awkwardly hoping they don't mess with it, either that or roleplay as the secret police and begin the interrogation.