Two Monkeys

Two friends meet after a very long time:
1 “Hey, how are you? Do you still play music?”
2 “Yes, sure, I play with an orchestra”
1 “Ah, nice, how does it look like?”
2 “It is a quartet”
1 “OK… and how many are you?”
2 “We are three”
1 “And who’s in it?”
2 “It’s me and my brother”
1 “Wait, do you have a brother?”
2 “No…”