Hi A.:
As a parent of a 15 year old who slept with us until he was 3, I agree with all comments. You need to decide if it's a big deal and stay the course. But, it doesn't necessarily mean that your other kids will want to sleep with you, too. Does that make sense? My 9 year old spent most last summer in our room because he was having a hard time sleeping soundly. He started in his room, but there was a blanket and pillow in the corner on my floor (don't make it too comfy), but he knew if he woke up he was just to cover up in the corner in my room and not wake us! The blanket is still in the corner and hasn't been used since school started back up. My 11 year old daughter slept thru the night starting at 8 weeks and has never spent a night in our bed. See where I'm going with this?
I was a working parent with my oldest and it just seemed right to have him sleep with us. I was hugely stressed about it though becasue all the grandparents and "experts" said it was a bad thing. Knowing what I know now, I wish that I had just gone with my gut and not been stressed out about it. My daugher has slept on her own without a tear. It can be nerve wracking to listen to your child scream.
Maybe your little boy craves the quiet closeness he gets with you. Good Luck to you!
P.S. I completely don't agree with the TV, though.
On the potty training, my 15 year old wasn't potty trained until well after he turned 3. He is potty trained now, is 6'2, plays high school football, basketball and baseball. When I'm mad at him, I remind him I'm the one who used to clean his dirty butt!
Our first born sons sound an awful lot alike. The time does go just way too fast and he'll "conform" soon enough. Enjoy your trip!