Final answer:
The OT should recommend Validation therapy to the husband to manage his wife's repeated requests for her mother.
Step-by-step explanation:
The strategy that the OT should recommend to the husband to help manage the situation with his wife is Validation therapy. Validation therapy is a communication technique used with individuals with dementia that validates their feelings and helps them feel heard and understood. Instead of trying to correct or redirect the person's thoughts, the husband can validate his wife's emotions and provide comfort and reassurance.