Final answer:
Anet is Janet's sister and Morgan is her nephew.
Step-by-step explanation:
The relationship between Anet, Morgan, and Missy is that Anet is Janet's sister and Morgan is her nephew. Anet and Morgan moved in with Janet and her mother, Missy, on April 12 and stayed through the end of the year. Janet plans on claiming Morgan as a dependent. They are all U.S. citizens and Janet provided 80% of her and Morgan's support.