My husband's mother was Gladys Sabra Jennison; her line was Charles A. Jennison, Charles W. Jennison, Rev. Isaac Jennison, Lot Jennison, Robert Jennison, Peter Jennison, Samuel Jennison and Robert Jennison, the immigrant. If they were originally from Massachusetts, I'd make a bet that they connected back there somewhere. They were in the area of Sudbury and Natick, Mass and each had numerous children.
Rev. Isaac spent some time in New Hampshire. Gladys Sabra was born in Natick, MA so you can see they stayed in that area but others spread all over the state.