Irma Arabella Black, {FICT}

Fictional Character Appearing in the Harry Potter Book Series:

DO NOT merge with real people or into the "big tree"

"...Irma Black (née Crabbe) was a pure-blood witch who was the wife of Pollux Black, the mother of Walburga Black, Alphard Black, and Cygnus Black III, (through her first child) the maternal grandmother of Sirius Black and Regulus Black, and (through her third child) the paternal grandmother of Bellatrix Lestrange, Andromeda Tonks, and Narcissa Malfoy..."

SOURCE: http://harrypotter.wikia.com/wiki/Irma_Crabbe