Sheree this sounds like a hard situation to be in.

If you do decide to go ahead with the adoption. I would have to say only do it if your going to follow correct legal procedures.
The reason i say this is because i know someone who has recently been to the courts to find out exactly what rights the parents have, unless you go through the correct channels with the courts the biological parents are legally allowed to take the child at any time regardless of how long you may have have the child for.

Good luck and please make sure you REALLY know what your rights are as a Adoptive parent.
Please keep us informed. Take care Leah