Healthy Sleep Habits Happy Child addresses this issue. It seems cruel, but Dr. W says that it is more important to re-establish healthy sleep patterns in your son than to worry about temporary guilt. His method is, after long soothing, put him in his crib drowsy but awake and leave the room. There will be crying, screaming, and possibly vomiting...but one year olds are extremely capable of manipulation. The book says if they vomit...have towels down in the crib for quick clean up once they've fallen deep asleep. They know what works to get their way (sleeping back in your bed). You and your husband have to make a pact to get your son back into healthy sleep. If you want make signs and tape them to the outside of his door "we are the parents and we are helping our child"..."though he may cry, he will not die"..."this is out of love, not friendship"..."marriage first, children second" etc. It will help in any moment of weakness. It usually takes 4 nights to re-establish crib sleep once they've gotten used to mom & dad's bed. 4 nights of unpleasantries is much better than years of prolonged sleep issues and possible parent-child resentment. The main reason that a no-nonsense approach doesn't work is because one or more of the parents give in and confuse the child (oh I'll just go hold him for a second, I'll just give him a quick hug then leave, I'm tired, I'll let them sleep with us just for tonight). You MUST decide if you are both are going to carry it out to the end. There are much "gentler" methods...staying next to the crib but not touching until they fall asleep...reassuring from across the room etc. But those only confuse the child more (IMO). Cold turkey is the fastest and most effective method. There leaves no room for negotiation. The crib is their bed...bedtime is bedtime...I am the parent and you are the child.
You may want to pick up Healthy Sleep Habits Happy Child if you don't have a copy...get the paperback version...it has helped my family more than you can imagine :)
Good luck!