Lyric discussion by MsMolly 

Cover art for Up the Wolves lyrics by Mountain Goats, The

I'm pretty sure the line is "our mother has been absent". Singular, not plural.

I've always seen this one as John and his sister, left to their own devices in the "Rome" of his stepfather's house, and the resentment they must have felt towards their mother for not protecting them from him.

"there'll always be a few things maybe several things that you're gonna find really difficult to forgive"