In simplest terms, she's an ex-girlfriend of my father's who lives here now (because it's his place, not mine; I just live here).
There's also the fact that he's unwilling to kick her out and not man enough to stop sleeping with her, which causes her to bitch about their "relationship" (note: it doesn't exist) constantly, and God knows why she chooses to complain to me, but more so when she gets completely falling off her ass drunk, which is when the multiple personalities come out of the woodwork.
The incessant smoking doesn't help, either, particularly as both my father and myself have asthma.
And she never shuts the hell up, particularly when she's drunk.
She also doesn't work (she's on Social Security), so she's never out of the house unless she's driving (drunk) to get more beer.
That sucks and I feel for you, but man it could sooooo be worse.
Okay, I am being informed my my ever loving spouse I need to "get my butt off the computer and come to bed".
I will continue this tug of war tomorrow.