 Six of George's siblings reached maturity, including two older half-brothers, Lawrence and Augustine, from his father's first marriage to Jane Butler Washington, and four full siblings, Samuel, Elizabeth (Betty), John Augustine and Charles. Three siblings died before adulthood: his full sister Mildred died when she was about one, his half-brother Butler died in infancy, and his half-sister Jane died at age twelve, when George was about two. His father died of a sudden illness in April 1743 when George was eleven years old, and his half-brother Lawrence became a surrogate father and role model. William Fairfax, Lawrence's father-in-law and cousin of Virginia's largest landowner, Thomas, Lord Fairfax, was also a formative influence.
