The weather has been so variant lately, that I'm not sure whether to wear shorts or a down jacket.
Answer: The main theme in Lamb to the Slaughter is concerned with how we overlook the true nature of a person or situation when we allow preconceived notions to cloud our judgment
or you could also use the theme of betrayal
Explanation:
Vivian - Grant's girlfriend.
Viviana shows up to tell him that she wanted to see him and found a babysitter to watch the kids for awhile.