Legal Question in Family Law in Massachusetts

You don't mention whether the father is listed as the father on your son's birth certificate, or whether he has been adjudicated as the father by way of a complaint to establish paternity. If this gentleman is not listed as the father on the birth certificate, AND has not been established as the parent by the probate and family court, AND there is no existing court order relating to custody of the child, then you can feel probably feel safe traveling freely without the permission of the alleged father.

If there is a custody and visitation order in place in the courts, you should not remove the child from the country without the permission of the established father or the courts.

Everything Mr. Vaughn-Martel said is true. However, you could file a support pettition from the father here where the baby was born and I assume he lived at the time. You could also request sole custody at least temporarily and permission to go to Puerto Rico for a visit.

Assuming the court grants the orders and you take a certified copy of the order with you, I doubt a judge in Puerto Rico will seek to take jurisdiction.

Regardless, I suggest you speak with an attorney before traveling to Puerto Rico.