Robert is Jacob's son. Jacob has a sister named Angela who is married to Eduardo. Angela and Eduardo have two children, Sofia and Marco. How are Sofia and Marco related to Robert and Jacob? And is Angela Jacob's daughter? Provide a very brief response.
Sofia and Marco are the children of Angela and Eduardo. Angela is the sister of Jacob, making her Robert's aunt. So, Sofia and Marco, being Angela's children, are Jacob's niece and nephew. In relation to Robert, since Angela is his aunt, Sofia and Marco are his first cousins.

Angela is not Jacob's daughter. She is his sister. The information provided clearly states that Jacob has a sister named Angela, meaning she shares a parent or parents with Jacob and thus she is from the same generation as Jacob, not a subsequent one.