Answer:
territorial behavior.
Step-by-step explanation:
Territorial behavior: In psychology, the term territorial behavior is defined as a specific patterns of behavior and attitudes carried out by a group of a person which is based on the attempted, perceived, and actual control related to an object, physical space, idea which is responsible for involving defense, territory marking, habitual occupation, and personalization.
An individual encompassing a territorial behavior tends to protect, defend, or guard a particular area that he or she thinks belongs to him or her.
In the question above, Mr and Mrs Thomas are exhibiting territorial behavior.