Who knew that life would move this fast?
Who knew I'd have to look at you through a glass?
Certain jail visitations take place through a glass sound-proof window
Could also relate to the earlier line “and this is for the family that can’t be with us” which refers to family members that have passed away. “Looking at you through a glass” could therefore mean looking at them through the glass of a framed picture, as a photo is the only thing they have to remember them by.
To help improve the meaning of these lyrics, visit "Family Business" by Kanye West Lyrics and leave a comment on the lyrics box