They apparently had a large family but Severance could find no trace of them (Severance, B. Frank. Genealogy and biography of the descendants of Walter Stewart of Scotland and of John Stewart who came to America in 1718 and settled in Londonderry, N.H. Greenfield, Mass. : T. Morey & Son, 1905, pg. 69)

findagrave notes has the following:

Daughet or John Stewart and Rebecca Stewart.

Married Daniel Allen on 12 sep 1793 in Colrain, Franklin, MA.

They had the following Children
1- Lydia Allen
2- John Allen
3- Rachel Allen
4- Rebecca Allen
5- Ruth Allen
6- Daneil Allen
7- Joseph Stewart Allen
8- Caroline Allen
9- Albert Loomis Allen
10-Diadamia Amanda Allen

Conflicting information on findagrave regarding the exact marruage date, and birthplace of Dr. Daniel Allen.

Dr. Daniel Allen was born in Colrain Mass. in 1770. He and Nancy were married 12 Feb. 1793. Nancy Agnus Stewart was the daughter of Lt. John Stewart who was a son of John Stewart Sr. and Rebecca Costa. Dr. Daniel became one of the first medical doctors in the state of New York. He began practicing in Hamburg New York in 1807. Although he was a very well-learned and highly educated doctor in his chosen field, there was most likely never much money while his 10 children were growing up, because people in that period of time expected a doctor to come care for them as a DUTY, rather than as a service to be paid for. It was also a period of much "witchery" and "quackery" so some people were hesitant about whom to pay. Also, many had very little money to give, so much was bartered. Dr. Allen moved to Chatauqua County in 1807 and lived there during the war with England in 1812. In that war he served his country as a soldier. There was a long period following the was when most of the people had very little money in fact many were so poor they were embarrassed during that period of distress and privation, for indeed it was such a very poor period for most of the country. The effect of that war was felt for a very long time, then too, the services of the physician were way under-valued by the general public. Many of the doctors in the area who belonged to the Medical Society took up other, more lucrative professions. Apparently Dr. Daniel Allen loved it too much and was so dedicated to the healing and care of people that he would not give it up, so he put up with the inconveniences for quite some time. When the fires broke out in Boston he went there to assist in any way he could. As the country and the people became more prosperous, so did the Allens, so that he was at last able to see that his children received good educations for that period of time and each were held in high esteem in the cities and villages where they resided. Doctor Allen moved with his wife and children to Montville, Geauga County, Ohio where they lived the rest of their lives.