Michael Maxfield - More info needed

Comment from https://familysearch.org/ark:/61903/4:1:LZFH-Y2G

No record of Michael's birth has been found, however his father's will clearly stated that Michael was the son of John. Michael's gravestone states that he died in July 1800, at the age of eighty years. This would place his birth between July 1715 and July 1716. As his sister, Elizabeth, was born in that time period, 30 April 1716, Elizabeth Wright speculated that he was "possibly a twin of Elizabeth." Other researchers have followed that speculation.

There weren’t two Michael sons in his father’s will, were there?

The FS comment is from

http://maxfield5.tripod.com/maxfieldjs3002.html
Notes
Descendants of John Maxfield
of Salisbury, Massachusetts
Third Generation

MICHAEL3 MAXFIELD (John 2-1) was born probably at Salisbury, Massachusetts about 1715/6, a son of John Maxfield and his wife Sarah Ordaway. He died at Chichester, New Hampshire, on July 1800[1]. He married at Salisbury on 8 April 1752 SUSANNAH CARR[2]. She was born at Salisbury on 25 October 1731[3], a daughter of Robert and Hannah (Eliot) Carr. She died at Salisbury on February 1776[4]. …

(Dead link - glad FS preserved it, it’s a good study).