Although there is still a little doubt about this, I am pretty sure now that mom and that major asshole are still dating.
Yesterday, mom was apparently talking to my brother about it all, and he told her something like he was annoyed and that they're probably still dating, and she apparently replied to him "So what if I am?". That kind of thing makes you assume that they really are still dating.
Later on in the day, the asshole told mom "I love you!" rather loudly, and mom replied "I love you too, darling". Even more material to make you assume they're still partners.
At one point yesterday, the asshole told my sister that she should grow up and some other crap, and sister packed up her things saying she was going home. The asshole apparently stormed out of the house at this point, and mom was angry with my sister and was telling her to get back in the house, but she didn't listen. I never witnessed the asshole leaving, or the growing up speech as I was sleeping, but was soon woken by mom's yelling and shaking the hell out of my bedroom door. She then wanted me to go and talk my sister into coming back.
I really had no idea if I could catch up with my sister as I had no idea which direction she'd gone. From where I am, there are several different paths to take to get into town, so had to just go with an assumption of direction and hope I was going the right way. Luckily, the assumption was correct. She was stood about a quarter of the way down the line, really upset. Spoke to her for about 20 minutes just asking her what the hell happened, and insulting the asshole because he really doesn't deserve to be with anyone.
After getting her back into the house, mom was talking to us for about 30 minutes, then she went to sleep, and my sister, my youngest brother and I proceeded to walk down to my grandfather's place. Explained to him that we all wanted to get out of the house due to the asshole being around. Although he wasn't around at the time, it was inevitable that he'd end up returning. He seems to turn up daily now, which is a major fucking pain in the ass. None of us want him here, and mom constantly ends up crying and accusing us of not wanting her to be happy. Clearly, as long as he's around, she's never going to be happy anyway. All it will take is for one of us to die or something, and if mom remotely cares about us, she'll be upset, mourning us, and the asshole, just as he did with an old school friend's mother, will walk out on mom because he's not getting all of the attention.
How can anyone be happy with a person like that.
Anyway, as my brother has told me, it's fine. If she wants to see him, that's her stupid ass choice, but none of us want to see him around. It's basically true really. If she wants to be retarded and date a complete and utter asshole who isn't happy unless all the attention is focused on him, fine. Just don't make us have to deal with the fucking asshole.