@ mi62014
It might seem difficult to answer questions asked by landlords, however if you choose to lie and are found out then the landlord would have grounds for terminating your tenancy
I’m an orphan. The landlord (actually his “referencing company”) wanted contact details for my parents, and wouldn’t process the form without it. In the end, I just gave the address of the cemetery.
Whether this is a lie or not depends on your religious beliefs I guess…
Maybe it should have the address of a clairvoyant 
To be honest, if it ever went to court, I suspect the argument “Ask a stupid question…” would probably win the day.