Clement Peter Brown was born in May 1875 or 1876 to Clement Brown and Adaline Cagle, likely in or near Leicester, Addison County, Vermont. He first appears in the 1880 US Census under the name of "Clement P Brown", age 4, born in Vermont. He was later known publicly as Peter Brown, according to multiple newspaper social notices. He grew up in the Brown family in Leicester.
According to social notices in the Middlebury Register and the Burlington Weekly Free Press, he was married. From this, and the details of his parents' birthplaces, he can be found in the 1900 US Census (born in Vermont, with both parents from "Canada French") married to Annie, circa 1894. Annie (b. Oct 1875) was born in New York to parents from the area. Together they had 3 children at the time, all born in Massachusetts: Edward (b. Dec 1894), Laura (b. Mar 1897), and Carrie (b. Dec 1898).
From the 1900 Census it is noted that Peter is able to read, write, and speak English, while his wife could only speak English. He worked as a farmer - natural given that he had grown up on his father's farm. Their residence was at 20 Perkins Street, Salem City, Essex Co., Massachusetts, which appears to be a multi-family building from the census dwelling numbers.
A rough timeline can be constructed:
late 1893 to early 1894: Married
1894 DEC: MA (birth of Edward)
1897 MAR: MA (birth of Laura)
1898 DEC: MA (birth of Carrie)
1900 JUN: Salem city (Ward 5), Essex County, MA
1905 APR: Malden, MA
1906 OCT: ??
1907 SEP: Nolton, NY
1907 NOV: Whitehall, NY - "they have leased a hotel"
1911 JAN: possibly "Meriden, Conn" from phrasing, but very uncertain.
Mentions of Peter visiting his parents in Leicester in the local papers of Addison County, Vermont appear to end prior to his father's death in 1915.
He was still living in September 1926, when mentioned in the obituary of his sister Amy E. Wells as surviving her and presently living in New York; he is identified as "Clement Brown".
Sources not yet found:
Record of Birth
Record of Marriage
1910 US Census or any census thereafter.
Date of Birth: Given that the 1880 US Census was taken on June 1st, it would suggest that he was born in May of 1876 if his age were indeed 4 years old. However, the 1900 US Census indicates his birth as May of 1875. No birth registration has yet been found for him.
No marriage record has been found for Peter and Annie.
No birth record for their children. (Checked all Edward Brown, Carrie/Caroline/Cathrine Brown, and Laura Brown matches in a +/- 1 year window using AmericanAncestors.org)
Unlikely Alternatives / Mismatches
There is another man named Clement P. Brown, born in Vermont in April 1876 and living in Walton Township, New York in the 1900 US Census. However, his father is indicated as being born in "Canada Eng" and his mother in "Vermont", which would conflict with what is known about the Peter Brown of this profile.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MSXM-GB4 : accessed 31 May 2018), Clement P Brown in household of James M Loomis, Walton Township Walton village, Delaware, New York, United States; citing enumeration district (ED) 34, sheet 18B, family 492, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,022.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M8WW-ZVH : 15 July 2017), Clement P Brown in household of Clement Brown, Leicester, Addison, Vermont, United States; citing enumeration district ED 9, sheet 104C, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 1340; FHL microfilm 1,255,340.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M9RD-XSS : accessed 31 May 2018), Peter Brown, Salem city Ward 5, Essex, Massachusetts, United States; citing enumeration district (ED) 456, sheet 1A, family 6, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,648.
Burlington weekly free press., April 20, 1905, (Image 1): LEICESTER. Peter Brown of Malden, Mass, and his sister, Miss Amy of Chester have recently visited their parents, Mr. and Mrs. Clement Brown.
Burlington weekly free press., October 11, 1906, Page 2: (Image 2): LEICESTER. Peter Brown and his wife are guests of Mr. and Mrs. Clement Brown.
Burlington weekly free press., September 12, 1907, Page 2. (Image 2): HAPPENINGS IN VERMONT. LEICESTER. Mr. and Mrs. Peter Brown of Nolton, N. Y., are guests of his parents, Mr. and Mrs. Clement Brown.