You need to think in a normalized fashion to do this.
ShoppingList
ID
... your other fields
Person (Table for anyone, both husbands and wives)
ID
... your other fields
ShoppingListPeople
ShoppingListID (Foreign Key to ShoppingList)
PersonID (Foreign Key to Person)
If you do this then you have achieved:
1) Normalized data
2) Now any number of people can be assigned to a given shopping list