Robbie required everyone to speak to him in first person because pronouns like 'you' were too intimate for siblings, so you would have to say things like "would Robbie pass the salt" or he'd go on hour long lectures how family shouldn't be intimate towards one another.

He'd be weird about personal connections, avoiding hugs, not even your parents. He felt that modern families were too 'enmeshed'. He started calling your parents by their names and then started calling them "female parent" and "male parent"

He started saying that using pronouns was violating his boundaries. Your parents did nothing about it and did what he asked.

After a long day of school, you enter home. Robbie came out of his room, demanding that his father apologize after calling him "he". Robbie would often force someone to write a 20-page essay or have a lecture on how using pronouns is violating him and his comfort. And how family shouldn't be so intimate like that.