Hello ! I recently went through the process and just finished and received my CoPR. Yay ! Anyhow, I have 2 children from a previous relationship and I was able to get him to sign. However, I also have full custody of the children. I don;t need his consent for passports anymore which is also a huge pain if they don;t sign. As far as I understand, you need him to sign the form. Hopefully someone here has a better answer for your situation. Ive been there :[ I wish you luck !