[3] Molly Custis' brother, William Henry Fitzhugh, supported his niece Anne Lee and her six children by allowing them to stay at his home at Ravensworth in present-day Fairfax County, Virginia, where she died in 1829.

Molly Custis was a member of a family network in Northern Virginia that helped revive the state's Episcopal Church in the first part of the nineteenth century.

Molly Custis promoted Sunday schools and supported the work of the American Colonization Society.

[2] She followed the teachings of the Second Great Awakening, with its emotional surrender to a just but inscrutable God and rejection of transient worldly pleasures.

Her husband survived her by four years, at which point Arlington House and the grounds were inherited by their daughter Mary Anna Randolph Custis, Mrs. Robert E. Lee.