I suggest trying to talk to your neighbors and explaining to them that you need the curb space.
Your sister may be inciting conflict. Please post pics of her so we can better analyze the situation.
Well Pinkie does hide them everywhere so it does make it kinda hard.
Yeah if she’s at least a DD I can see a lot of conflict between them and a rod.
We can do this the simple way, I prefer to keep it complicated.
yeah my neighbours are always hating on everything. they’re all nuts, i’m pretty sure they’ve put me in a mental health area and every time one of the neighbours cars gets busted they always blame me. I can assure you I’m not the shiftest looking person here
I agree with ElderGOD, this is the only way we can truly hope to solve this problem.
Don’t forget the peehole torture. It’s always relevant.
I’m too late for a funny comment to be relevant 
I would have their car towed if it was in front of my spot. But that isn’t nearly half as fun as knocking on their door loudly in the middle of the night and proceeding to spit in their collective faces as you explain to them the reason you have a gun pointed at their head is because you can hear them in the walls and you fear for their very souls. Make sure you tell them my man Jesus says hi.