The biological father should be supporting his child -- no doubt about that! I don't know the Canadian laws concerning CS, but I do know that your step child did not ask to be put into this situation. How sad is it that our kids have to suffer for the bad choices we make?? I wonder if the biological dad has a clue?? I hope you are able to work out something that is financially equitable.

We all worry about our legal rights -- We should worry as much about the children.

Good luck to you.