I have an Isaac Brackens married to a Myrtle. Isaacs father was John A Brackens b:1857 in Grayson Co Virginia, mother was Susan Matilda Callahan b:1857 Comer's Rock, Grayson, Virginia. He did indeed have an aunt named Margaret, and several other aunts and uncles.
Please get in touch I would love to share with you and collect what you have.