On 19.12.1913, at Quincy, MA, John Nestor Piispanen, age 26, married Anna Marie Nummelin, age 25; both of Quincy.John Nestor Piispanen was a Quarryman and born in Finland.Parents identified as Lauri and Susie Kesinn.Anna Marie's parents were John and Amelia Makkila.I think this is the John Larson shown in the 1910 US Census.
WWI Draft Registration:John Nestor Piispanen, Quarryman, address 6 Forest Ave., Quincy, MA; born 15.5.1886; wife Annie N. Piispanen, same address
WWII Draft Registration:John Nestor Piispanen, same birth date, address Hobomock St., Pembroke, Plymouth, MA
Family Tree on Ancestry.com:John Larsson, born about 1887; mother Susan, born 1858; no father shown; 1910 US Census attached, showing Louis Piispanen, wife Susan, step-son John Larson.
1920 and 1930 US Census show John N. Piispanen, wife Annie M. and children on Hobomock St, Pembroke, MA