It's wrong to interfere in a sibling's relationship.
Jenny is worried that her sister's boyfriend won't be able to provide financially for her.
Jenny wants to make sure her sister is happy.
Jenny talks to her sister about her concerns, and offers to help find a better paying job.
Jenny confronts her sister's boyfriend and demands he get a better job to earn more money.
Jenny's sister is grateful for the help and feels more financially secure.
Jenny's sister is angry at the intrustion and stops speaking to Jenny.