Well, if you’re an asshole, you’ve got some fun company, meaning…me!
I don’t get the heebie-jeebies about dead folks, speaking-ill-of-the-dead, etc. They’re dead - they can’t hear you (and even if they could, presumably they’ve got better things to occupy themselves with).
Death generally does very little to improve the deceased’s personality, but in the case of this particular man I’ll make an exception. He’s dead and out of your life - enjoy it, but keep hiding your nastier feelings for your step-sisters’ sake (it sounds like you already are succeeding at that).
Well, you asked for opinions. I don’t call someone an asshole for how they feel; I might call someone an asshole for how they act. Go ahead and feel any way you like. If you let how you feel prevent you from supporting your stepsisters in any way that they need when their father has just died, then you’re an asshole.
From what you say, you regard your stepsisters as your kin, but not the wanker as your father. Fine. You don’t have any kind of trauma as an excuse. But they do. A wanker he may have been, but he was their father. Emotions are at best mixed at times like these. You don’t give enough information for anyone to tell what the best thing to do for them is, so it is hard to tell if you are being an asshole or not, but that is how to decide. Support them as best you can. The wanker doesn’t count. You don’t count, not for the moment. They do. Later on it may be different, but that is how it stacks up now.
I don’t think your an asshole for it either. He obviously was an asshole. Guy had half a million dollars and spent it all in 20 years? does he not know how to invest? sheesh. What kind of loving father spends his kids educational money. Oh, yeah, I guess the type that wants his kids to end up loser asshole’s like him.