I'm not sure if this is the right place to put this but I need some advice QUICK! I've posted before about my sister-in-law wanting to put her son up for adoption, well we found a family to adopt him, and paper were 1/2 signed (the father terminated his rights so that the family could adopt him). Yesterday my sister-in-law called me and told me she wasn't going to go through with this. Now, my boss (is the one that was to adopting couple)... I went to him and told him of her decision he was so crushed. They were to fly out here on Thanksgiving and meet the little boy. I'm so sad for my boss and for the little boy since his life thus far has been a struggle and now the rest of his life will be the same. Is there anything that I can do to make some sense of all this emotional pain we are all going through. Is there anything legally that can be done since the father wanted this family to adopt his son? HELP PLEASE!

No, both parents need to agree to the adoption and either can change their minds right up to the last minute.

Straight forward answer

Im so sorry you are going through this emotional turmoil. I have heard many adoptions go this way and unfortunantly, it is commonly a part of the adoption process. Biological parents have the right to change their minds and as sad as it is, everyone will have to learn to cope with the pain, dissapointment and loss.
There is nothing legally that can be done. Next time, the adoptive couple might have a lawyer draw papers and go through a legalized adoption agency, experienced in dealing with adoptions and biological parents. These agencies attempt to 'weed out' the parents who seem undecided or are sitting on the fence or may even tip one way after saying the will go another.

Maybe this baby was just not the right one for this adoptive couple.
It must be very hard for you because you are in the middle of it all. Do remember to keep your relationship with your boss as professional as possible, so no resentment accidentally grows between you and leaks into the workplace.

All the best and time will heal wounds, look forward and onto lifes next opportunities.