Lt. Jonathan Philbrook was born about 1694 in Greenland, Rockingham Co., New Hampshire and baptized there on 25 Mar 1694. He died in Georgetown, Sagahadoc Co., Province of Maine, Massachusetts. He was a shipwright and farmer. He was married to Elizabeth Whidden on 31 Jan 1716/17 in Greenland, Rockingham Co., New Hampshire. She was his second wife.

Elizabeth Whidden was born about 1694 in Portsmouth, Rockingham Co., New Hampshire. She was also known as Elizabeth Whitten. Children were:

i. Elinor Philbrook was born about 1717 in Greenland, Rockingham Co., New Hampshire. She was baptized in 1722 in Greenland, Rockingham Co., New Hampshire.
ii. Willam Philbrook was born in 1718 in Greenland, Rockingham Co., New Hampshire. He was baptized in 1722 in Greenland, Rockingham Co., New Hampshire. He was a blacksmith.
iii. Capt. Jonathan Philbrook was born in 1721 in Greenland, Rockingham Co., New Hampshire. He was baptized in 1722 in Greenland, Rockingham Co., New Hampshire. He died in 1801 in Clinton, Kennebec Co., Province of Maine, Massachusetts. He was a mariner.
iv. Priscilla Philbrook was baptized in 1722 in Greenland, Rockingham Co., New Hampshire. She died on 17 Feb 1801 in Attleboro, Bristol Co., Massachusetts.
v. David Philbrook was born about 1724 in Greenland, Rockingham Co., New Hampshire  and was baptized there as well in 1724.
vi. Abigail Philbrook was born about 1725 in Greenland, Rockingham Co., New Hampshire and baptized there in 1725.
vii. Deacon Joshua Philbrook was born on 10 Oct 1727 in Greenland, Rockingham Co., New Hampshire. He died on 27 May 1821. He was a shipwright.
viii. Job Philbrook.
ix. Sarah Philbrook was born about 1731 in Greenland, Rockingham Co., New Hampshire and was baptized there in 1731.
x. Joseph Philbrook was born about 1733 in Greenland, Rockingham Co., New Hampshire.

Lt. Jonathan Philbrook married as his first wife Mary Springer.