I feel your pain. My husband and I are going through kinda of the same thing. I KNOW YOU ARE DOING WHAT YOU FEEL IS BEST FOR YOUR CHILDREN. Because that is why we are doing it too.
From all the legal pages and custody laws I have read, the courts will not allow you to sign over your parental rights unless there is a step-mother willing to adopt your children. They will not allow the children to not have a mother.
Good Luck and I will keep you in our prayers!
And to the lady who is being so nasty and judgemental on here......get off your high horse!! You can not tell anyone what to do. And those that judge others, are usually the ones with problems of their own and low self-esteem. Shame on you for being so heartless!! I WILL DEFINITELY BE PRAYING FOR YOU!