In 1943, Pete married Toshi-Aline Ōta, whom he credits with being the support that helped make the rest of his life possible. Their first child, Peter Ōta Seeger, was born in 1944 and died at six months while Pete was deployed overseas. Pete never saw him. They went on to have three more children: Daniel (an accomplished photographer and filmmaker); Mika (a potter and muralist); and Tinya Seeger (a potter) – and grandchildren Tao (a musician); Cassie Seeger (an artist); Kitama Cahill-Jackson (a filmmaker); Moraya; Penny; and Isabelle. Tao is a folk musician in his own right, singing and playing guitar, banjo and harmonica with the Mammals. Kitama Jackson is a documentary filmmaker who was associate producer of the PBS documentary Pete Seeger: The Power of Song.
Seeger lives in Beacon, New York. He remains very engaged politically and maintains an active lifestyle in the Hudson Valley Region of New York, especially in the nearby City of Beacon, New York. He and Toshi purchased their land in 1949 and lived there first in a trailer, then in a log cabin they built themselves.