non custodial fathers rights

I have just discovered from public documentation that is several years old, that my ex wife remarried some time ago. In this same dated document I saw that my son's last name was not used, rather her new married name. This to me indicates some sort of adoption/name change took place outside of Massachusetts involving the new husband, and without my being notified.

I do not object to her adoption actions as they are likely the best for my son. however if, as I have come to somewhat understand, I should have been informed and my parental obligation changed/ended upon my sons adoption, then I have likely been defrauded out of many thousands of dollars during which time I have been living hand to mouth.

How can I verify if adoption took place and if found to be so what is my recourse? Also how would this affect my obligation as the non-custodial parent?

Thank you in advance for your advice

My friends are only allowed to see their children with her mother present, they are in the hospital right now and she is giving birth to a baby boy and both parents are wanting to be with their son in the hospital tonight. Her mother is willing to stay all night so they can do this but the hospital said they will not allow three people to be in the room overnight. Is there anything they can do to be with their son? They do have an interesting past with substance abuse but both have done the classes and are trying to get the kids back. They are trying to change their lives which is why I hope they will be able to get this one night with their first boy.

Thank you