Guest Dinner, overstepping the mark

Guest Dinner, always a treat, lets be honest. A chance to get boozed up essentially. This time was different however, as I was invited by a 21 yr old lad who was here with his 'sister'. I spoke to the restaurant who said he had booked a table just for 2 in the gazeebo (for all the couples!), and I was having kittens. Was this another of Kat's greatest moments that make me want to die but everyone else finds hilarious?!? We turned up and THANK GOD he was there with his sister and some other geezer who had tagged along and it was a table for 4. So to my horror when they asked us if we wanted any wine (which I must stress is FREE) THEY WEREN'T SURE!!!!!!!! This is like, obligitory at guest dinners fro crying out loud. Anyway they gave in and we got a bottle, which I felt like I consumed the whole of, and 2 of them weren't even on the devils juice! Crazy kids. The question still remains if they were just 'bro and sis' as many people had told me they had seen him hand in hand with some one on the beach! Please tell me they had separate beds.