Final answer:
Without additional context, it's not possible to determine the relationship between Wagner and Lisa.
Step-by-step explanation:
To determine the relationship between Wagner and Lisa, one would need additional context as this question could be in reference to a variety of subjects such as literature, history, film, or even a case study in a social sciences class. Without specific context, it is not possible to accurately answer whether Wagner and Lisa are friends, siblings, colleagues, or cousins. Context is key in understanding the nature of relationships between individuals in any subject matter.