Lucretia Black - daughter of Arcturus, sister of Orion, wife of Ignatius Prewett, aunt of Gideon, Fa
Lucretia Black - daughter of Arcturus, sister of Orion, wife of Ignatius Prewett, aunt of Gideon, Fabian, & Molly Prewett in addition to Sirius & Regulus. -- source link