My 2 1/2 year old still has a pacifier...what do I do?

I have a 2 1/2 year old son who WILL NOT give up his "paci". I tried to take it when I quit feeding at 1 yr and 3 months and it was just too much for him to give up both at once. (He drank nothing but red kool-aid for 6 months and wouldnt take anything else not even water!) The next time we tried to take it away I found out I was pregnant. Being the only child and only grandchild he decided he needed even MORE attention because another baby was comming and started backtracking. Crawling, crying more, having to be rocked to sleep for naps(we co-sleep at night--Yes still), held constantly, ect. He wouldn't even let the paci out of his sight to eat. It still has to be right next to his plate. Right after I had my daughter a friends son fell into him and knocked him into a table face first. The pacifier saved him from having all the front teeth knocked out but they were chipped. So he kept the pacifier because the cold air seemed to hurt when crossing his teeth and the paci protected them. Now after all we have been through we try one more time to take it away and lo and behold.....HE STEALS HIS SISTERS!! We can take it away and he snatches it right back the minute we turn around. She is only 5 1/2 months old and we do not want to take hers away yet because she is fed and I cant feed her everytime she wants to suck on something. He is the most headstrong child I have ever came across and I had a sister with ODD and a brother with ADHD. He tops them both together! I just dont know what else to try when I have tried 4 or 5 methods!