Are you giving him dinner or a snack before bed? I try to make sure my 11 month old is going to bed on a full tummy. If dinner is early, then I give her some "sticking" kinds of foods, like oatmeal. as a snack before bed.
I'm trying to imagine you trying to get the baby back to sleep in a room with the other kids. We did let our kids cry it out, but not before they were at least 9 months old. My baby, we didn't have to because I could put her in her crib awake and she'd put herself to sleep. If you do what the previous post mentioned, you will still have the issue with the other kids in there. Can they camp out in your room with dad, while you spend a night or two getting baby to sleep in his own crib? Can they camp out in another sibling's room? Or in the living room?
Does your baby nurse to sleep for naps? My older kids would always fall asleep nursing, so I would then lay them in their cribs to sleep for naps/nighttime. My baby didn't always fall asleep to nurse, but still had to nap, so I would lay in my bed with her for her to sleep. She would fight naps, so instead of putting her in the crib and walking away, I laid on the bed with her and let her cry with my right next to her. She would eventually fall asleep - because it was absolutely nap time and she fought it something horrible. I didn't feel like I was abandoning her with the traditional CIO method, cuz I was right there. Now, with a 1 year old, that probably isn't an option, because he will climb on you and off the bed. How about putting him to sleep in his crib for a nap, awake. You could lay on the floor next to the crib, so he knows you are there, but it's naptime, so he needs to stay in his crib until he falls asleep. You are there, so there's not the abandonment issue. He's fed and tired, so you know he needs the sleep. Maybe working on teaching him to put himself to sleep during the day at naptime will work better. There aren't other kids in the room and your baby will still learn to soothe himself with you there. Just a thought. I did this with my baby when she was about 3-4 months old, before she was mobile. It worked great and I wish I had done it with my older kids. It's really hard to teach a baby to put themselves to sleep without some crying involved. It's a great thing, once it happens, though!! Believe me, I understand not wanting to hear your baby cry and not go to him. Hopefully, if he can put himself to sleep without nursing or getting a bottle, the nighttime wakings will cease. I wish you luck!!!