Jean-Baptiste was named John by his parents (see note below), who are listed on his marriage contract as "deceased Richard Otis and Anna Otis living english woman of nation". This is the only actual document listing his parent's names. He was born between 1680-1683 (depending on the document), in Cochecho, New Hampshire. Cochecho is no named Dover.

He said he was 17 at the time of his baptism on 10 April 1700, which was Easter Sunday. He had been captured in 1697 by some pro-French Amerindians, who attacked Dover in retaliation for the *Cochecho Massacre. He was one of the first recorded Colonials who was captured and sold by the Amerindians to allies in Quebec. He had been educated according to the Catholic Church.

In Quebec, he was taken in by Jean Barrette and Jeanne Bitouset, who changed his name to Jean-Baptiste. He married (1) Cecile Poulin on 4 November 1703, in St-Joachim, Quebec. They are the parents of at least the following (verified with PRDH):
1) Marie-Josephe ( - ) md (a) Francois Quirion dit Daniel, (b) Jacques Fougere and (c) Jean Boldu

He married (2) Mare-Francoise Gagne on 9 February 1733, in Baie-St-Paul. They are the parents of the following (verified with PRDH):
1) Marie-Genevieve (1733-1789) md Francois Fortin
2) Jean-Baptiste (1734-1734)
3) Jean-Baptiste (1736-1789) md (a) Marie-Anne Tremblay and (b) Marie-Anne Bolduc
4) Augustin (1738-1738)
5) Prisque (1738-1738)
6) Prisque (1740-1445)

He was buried on 16 September 1760.

Note
Top three parental theories:
1) Richard Otis and Anne Otis Starbuck (this is in accordance with his marriage contract). These are the approved parents per to PRDH.
2) Richard Otis and Susanna Hussey Wikitree (no references given). However, it's possible that Anna was her nickname.
3) Robert Otis and Shuah Starbuck, the daughter of Elder Starbuck of Dover, N.H., who were married on 5 November 1677. Shuah married secondly, to Ensign James Heard. This is per (A) "Maine Vital Records, 1670-1921," database, page 131. (B) "Genealogical Dictionary of Maine and New Hampshire by Noyes, Libby, and Davis".

*The Cochecho Massacre or Raid on Dover (New Hampshire) took place on 27-28 June 1689, and started the King William's War. However, the massacre was in retaliation for an incident that took place during King Philip's War, on 7 September 1676.

Major Richard Waldron invited the local Amerindians of the Abenaki Tribe, along with refugees from the Massachusetts Bay Colony militia to participate in a mock battle against militia near Cochecho Falls. There were about 400 Amerindians, about half were local and half were refugees. After the Amerindians had discharged their guns, they were rounded up and taken prisoner. The refugees and about seven or eight local tribesmen who objected to the treatment of the refugees, were taken to Boston. The local tribesmen were executed for insurrection and the refugees were shipped mostly to Barbados, where they were sold into slavery.

The rest of the locals were released, but never forgave the violation of the rules of honor and hospitality.

The following was contributed by MarilynGeniSeeker:
In the "The Life of Jean Baptiste Otis aka John Otis," transcribed by Claire M. Rouner: "In February 1714, when the commissioners sent by Governor Dudley came to negotiate the return of the American prisoners taken during the War, and sold in Canada by the Indians, Jean Baptiste Otis refused to leave the country, as did also his sister, Francoise Rose. Both were established and married here, and they preferred to remain. They received shortly afterwards, we are told their papers of naturalization."