As most Llano insurance lawyers can tell someone, the answer to the titled questions is: It Depends!
A 1976, Waco Court of Appeals opinion gives some guidance on an answer. The case is styled, Westchester Fire Insurance Company v. English.
Posing as husband and wife when in fact they were not married, Reaves Hickey and Carolyn Meadows purchased a frame house and two lots from Fannie English. English conveyed the property to Hickey and wife Carolyn. by warranty deed with a vendor’s lien note. These documents were executed in front of and notarized by Westchester agent, Kenneth Logan. At closing Logan issued a standard homeowners policy on the house and contents. The premiums were paid and accepted by Westchester. A few months later and contents were destroyed in a fire. Westchester failed to make cover the claim, a lawsuit was filed, and prior to trial Westchester learned for the first time that Hickey and Meadows were not married.