Is Martha Borg the aunt of Grace and Joseph Larson?

To determine if Martha Borg is the aunt of Grace and Joseph Larson, we need to establish the familial relationships. An aunt is typically the sister of one's parent. If Martha Borg is the sister of either Grace or Joseph's parent, then she would be their aunt. However, without more information about the family tree or connections, it is not possible to definitively confirm Martha Borg's relationship as their aunt.