Can I successfully petition for my 17-year old stepson if my husband's AOS & 601 waiver is denied?

It is a separate petition. You can be approved even if his dad is not.

*Waiver of Inadmissibility* A Waiver of Inadmissibility will have to be obtained. This is an application that will include a legal brief, forms, documents, exhibits, declarations and other evidence. My firm can prepare the entire waiver, and attach all of the necessary documents. It will take several months for the decision, and if done correctly, there is a good chance of an approval. The Waiver essentially makes the crime or ground of ineligibility disappear so that entry or re-entry will be allowed into the U.S. Please note that the Waiver is the critical part of this application, and unless approved, there cannot be any other petition that will allow entry into the U.S. Therefore, the Waiver must be prepared with significant supporting documents. There are ways of making it stronger if done properly.

Assuming the prior misrepresentation requiring a waiver for your husband does not relate to the step-son/step-parent relationship, yes, you should be able to still petition for your step-son.

Yes. You may still petition for your stepson even if his father's AOS and waiver applications were denied, as long as the father's I-130 petition was approved to establish the relationship.

You can petition for your stepson and it should not be problematic.