Need help interpreting a covenant in our lease

"Not at any time to use or occupy or permit the Demised Premises to be used or occupied except as a private residence in one family occupation only"

What does this mean, does it strictly mean blood related members of the same Family, or can a non related person reside at the property, what is the interpretation of the lease as Section 61 of the Law of Property Act 1925 shall apply in the construction of our lease dated 11th July 1986