Martin Underwood and wife Martha also lived in Watertown (relationship to Joseph and Thomas not known). He was from Elmham, county Suffolk, England.

April 30, 1634, age 38, came on Elizabeth of Ipswich to America16

August 23, 1663;  Will made. No children.  "August this 23, 1663.  In the name of God Amen: I Martaine Underwood dwelling in Watertown being in perfect memory do ordaine this as my last will and testament.  first I do commend my soul unto God from whome I have received it and my body to the earth believing and expecting a resurecion unto eternal life in and throught the meritts of Christ Jesus.  As for my temporall estate I do bequeath it all unto my deare and beloved wife and doe make her sole executor of all my estate wheather lands, chattels, or moveables and after her death I do gve and bequeath my house and homestall and barne with all my lands in Watertowne, and all my rights belonging to me now or may hereafter unto my kinsman Nathan ffiske: Provided that in case my deare wife have need to make use of any part of that estate bequeathed unto my cousin Nathan ffiske for her releife and comfort then it is my minde and will that she shall have full liberty to make sale of any part of the before bequeathed estate for her comfortable subsistence: and farther in case my cousin Nathan ffiske should dye without heyres, executors or assigns it is my minde and will that my cousin John fiske his brother shall injoy all that I have bequeathed unto my Cousen Nathan ffiske: and further it is my minde and will that in case any of my sisters children should after my decease come over into this country to lay claime to any part of my estate before bequeathed and given: that it is my minde and will that so many of them as shall come over shall have twenty shillings apeece to be paid out of my estate in on e thing or another as my executors can best pay and further it is my minde and will that after my debts and funerall expenses be payed that wrever of my estate shall be left indisposed by my wife and not given by her shall all fall into the hands of my Cousen Nathan fiske: whome it is my desire after my wives death that he should be the heyre and owner thereof: I say him that is my Cousin Nathan fiske his heyres, executors, administrators or asins and in case my kinsman Nathan fiske should dye without heyres, executors, administrators, or assigns, then it is my will that my kinsman John ffiske his brother shall injoy all that my kinsman Nathan fiske should have injoyed if he had lived unto which will and last testament I have set my hand and seale.
                                                                 Martin Underwood (seal)
John Eddie
Thomas Underwood
(witnesses)"          (The Underwood Families in America)

There is no proof known at this time that Martin was a family member of brothers Joseph and Thomas Underwood of Watertown, although it is certainly likely that he is at least some sort of relation.  Due to date of birth, I have placed him as a sibling of Thomas and Joseph.