If an adult finds out he/she was switched at birth, what would be the legal consequences?

Interesting question.

I would not think that adoption laws would allow an adult to be adopted.

I have not heard of the equivalent of common-law marriage with regards to a parent-child relationship. I think that you have to look up legal precedents. No doubt they exist. You may have to see if cases of newly discovered adult child relationships can be applied here. There likely would be more examples of this.

Consider to what relationship, legally, exists between the adult child and the biological parents? And, is there a legal bond between the adult child and both parents?

Lastly, what does it mean to be a legal member of the family? The only situation where I think that this might be relevant is in the case of a will where part of an estate is left to "children/grandchildren" - and they are not specifically named. Unlike the case husband/wife - the law does not require that any part of an estate be left to children (to the best of my knowledge).

I would also not think that criminal charges could be filed against whoever switched because of the time passed. Civil charges may be an option because of the continuing affect of the act.

wow, this is actually a VERY grey area, but no it doesn't make him automatically stop being a legal member of the famil.y who raised him. Legally, even though switched, he is the son of that family.

No. Minors get adopted, not adults. The most likely outcome is a huge malpractice suit against the hospital.

You would become a social pariah and have to go live with gypsies. Sorry. Its the law.