I had originally composed a post with several thank you’s to the other postes to this thread, but it got eaten. In the interest of saving of time, let me just say THANKS! I’m enjoying reading your stories and responses. 
Now, without further ado, I give you:
Sarah Moore Grimke (1792-1873) &
Angelina Emily Grimke Weld (1805 – 1879)
Like much of the history that lead up to and directly influenced the Civil War era, Sarah and Angelina Grimke have received little attention despite their enormous contribution and sacrifice.
Born into a slave-owning family in Charleston, South Carolina, the sisters saw first-hand the treatment of slaves and the brutality the institution of slavery wrought on the entire community. The sisters were well educated by private tutors, but Sarah protested early when she was not allowed to learn Greek, Latin, philosophy and law like her brothers.
At age twenty-six, Sarah Grimke could no longer tolerate the politics of the south, and she moved from Charleston to Philadelphia in order to join the predominately abolitionist Quakers. Eight years later Angelina Grimke joined her and the two were never to return to the south. Their names would be anathema in their homeland soon thereafter and they were warned never to return, under threat of arrest.
In 1829, William Lloyd Garrison, a leading abolitionist and publisher of The Liberator, published a letter Angelina Grimke had sent him, which gave powerful testimony to the reality of life under slavery. Publication of the letter changed their lives forever, and made them heroines in the north and treasonous villains in the south. So began two lifetimes worth of tireless work and sacrifice for the causes of abolition and women’s equality.
The sisters faced opposition even from within Quaker circles and they were publicly rebuked numerously, especially Sarah Grimke, for speaking out on the politically charged topic of abolition. They would not be silence, however, and they became the first women in America to give public lectures on the abolition of slavery. In 1838 Angelina Grimke became the first woman in America to publicly address a legislative body in Massachusetts.
Shortly after this address, Angelina Grimke married abolitionist Theodore Weld in Philadelphia, in a ceremony unusual for its time—the guest list included black friends. This incited a riot in Philadelphia two days later and considerable damage was suffered by abolitionists and their property. Appalled, frightened and discouraged, the Welds moved, with Sarah Grimke, to a farm and effectively retired from public after this incident.
Later in life, the two women discovered two young mulatto boys who turned out to be their nephews, born of a slave raped by their brother on the family’s old plantation. They took these two children in and educated them along with the several children of abolitionists and feminists they were already teaching.
Among the Grimke’s literary contributions are Angelina’s Appeal to the Christian Women of the South and Appeal to the Women of the Nominally Free States. Sarah Grimke published, along with Theodore Weld, Slavery As It Is: Testimony of a Thousand Witnesses. All three continued to write and publish on political issues until their deaths. The sisters carried on a correspondence with Elizabeth Cady Stanton and Susan B. Anthony, as well as several other important feminist leaders at the time. In 1872, the frail older sisters went with Susan B. Anthony and 42 other women to cast their vote—a challenge to the 15th amendment and an effort to get the vote for women.