When Hendrick Blauvelt was born on 31 December 1721, in Tappan, Orangetown, Rockland, New York, United States, his father, Joseph Blauvelt, was 34 and his mother, Elizabeth Van Dalssen, was 31. He married Lena Smith about 1745, in Orangetown, Rockland, New York, United States. They were the parents of at least 1 son. He died after 1781, at the age of 61, and was buried in Tappan, Orangetown, Rockland, New York, United States.