Every family has one. Ours went to IIM-A, has opinions, and — this is the humiliating part — has actually read all of Prof. Tantri's notes. Ask him anything from the course. He will sigh, mention his alma mater, and then give you the correct answer with the source.
BIL talks to the cohort only
Sign in once and ask away. He answers from the course material — notes, sessions, takeaways — and cites which document he's citing. He is not a stock-tip machine, and says so rudely.
He only knows what the professor has written. Grades, gossip and stock tips are out of syllabus.