First of all, uncles are taller than uncles. Three uncles should sit in the back or behind three square tables, one for each person, and from inside to outside, uncle-brother-in-law, because you are four tables, the outermost table, uncle; In the second method, uncle and uncle sit at the innermost table, from left to right, according to size, uncle first; Of course, it depends on how your desk is arranged.