Definition: Given a real-life anecdote of a complex ethical situation, generate a suitable title that describes the main event/root cause of the situation. Imagine that the given text is a social media post, and you have to write the title of the post, so the users can decide to read the main text or not.
Input: Parent 1 cheated on Parent 2 when i was younger which led to a the a half sibling. Said Half sibling's mother is very poor, and my father is also not financially well off. Friends and family are saying I have an obligation to help out my half sibling, but I don't feel like I should be responsible for a child parent 1 had when they cheated. AITA? 

not wanting to help a half sibling out financially