Ana is the daughter of Hernan and Isabel. Hernan is Marta's uncle because he is the brother of Marta's mother. Therefore, Ana is Marta's first cousin. Isabel is the wife of Hernan, who is Jonas's uncle, making Isabel Jonas's aunt by marriage.
Jonas has a sister named Marta. They both have a cousin named Luis, whose father, Hernan, is Jonas's mother's brother. Hernan is married to Isabel, and they have another child, a daughter named Ana. How is Ana related to Marta, and how is Isabel related to Jonas? Make your response very short.