Well Garrosh is actually considered to still be alive, not dead. If you watch a cutscene from the new timless isle quest line shown from MMOChamp titled Visions of Time - Courting Destiny you can see a orc in prison claimed to be garrosh even by MMOChamp, heres the video.
http://www.youtube.com/watch?v=6HdRyY5W1wk
Its possible he gets to redeem himself and maybe he even does have a kid already.