Anduin's mother died in the Stormwind riots
Draka, Thrall's mother was murdered when he was but a wee lil baby.
Sunwalker Dezcon's wife died giving birth to twins.
Durotan's mother, Greatmother Geyah was alive in Nagrand but said she was dying.
Leyara, Fandral Staghelm's daughter-in-law went cray cray and we killed her.
Lianna Menethil, Arthas' mother. (Is MIA(presumed dead) alongside her daughter, Calia.)
Baine's mother, Tamaala is dead.
Moira Bronzebeard is alive, for now.
Thrall's baby momma, Aggra is still alive. For now, watch y'ere back missy.
Vareesa Windrunner is alive and kicking... For now.
King Greymane's wife, Mia Greymane is alive... For now...
Alleria Windrunner is MIA.
Everyone else apparently doesn't have a mother. Garrosh, Varian, Kael'thas, Arthas, Moira, Vanessa VanCleef and Jaina.
My point being, Blizzard has a bad track record for writing mothers. They've all either died pre-WoW and have been mentioned maybe twice(I actually had to Google who Arthas' and Baine's mothers were), were killed off, are MIA or are waiting to be killed off. It seems their only purpose is to pop out the child then die.