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Maybe they are friends and discussed their thesis topics with each other. I find it unlikely that 4 out of 20 students would come up with sibling related topics independently.
Or maybe they picked them out loud in class, and some of those were deliberate responses to others.
So what happens is: Albert is an oldest child whose younger sister is loud and annoying and gets all the attention. He says "I'm going to write about how being an older sibling is hard". Beth is a youngest child whose older brothers get all the new clothes and toys and things; she gets their hand-me-downs. She thinks Albert's got it all wrong and, determined to set the record straight, says "I'm going to write about how being the youngest child... (read more)