As the Washington family's eldest son, Lawrence received the benefits of
primogeniture. Upon his father's death when Lawrence was 18 years old, he inherited two substantial estates on the
Potomac River:
Mattox Creek (1,850 acres) and
Little Hunting Creek (2,500 acres) (which would eventually be renamed
Mount Vernon by Lawrence's grandson and namesake,
Lawrence Washington). Washington did not add substantially to either property during his lifetime, which some historians believe indicates his greater interest in politics and the law rather than plantations, although he also left personal property to support his widow and children, including 406 pounds sterling and 32,509 pounds of tobacco. Lawrence Washington assumed public responsibilities in Westmoreland County based on his landownership, and three times (first in 1684) won election to the
House of Burgesses to represent Westmoreland County's interests. Thus, he served for about a decade, with the exception of the 1688 session that was suppressed. He had begun his county service as one of the justices of the peace in 1680, and in 1684 Lawrence Washington became colonel of the county militia. He also served two years as the county Sheriff. Lawrence Washington also continued his father's roles as the county coroner, and took special interest in guardianships and estates, serving as trustee of the estate of Thomas Pope, the orphan Jan Hay, and Daniel Lisson's daughter born after his death. ==Family life==