Division, I think it would be best if I get you an address and YOU moved into the house for a while

No, seriously, I understand your curiosity and I don't mind to pass on what little I know. The blood in the bathtub was definitely over the top. I never had anything like that happen to me, but my brother swears by it.
As for you Q's:
1) The vision of the ghost was sometimes more concrete than others. It didn't appear like a projection and there were a few times that it was so solid that it looked as though someone was in the house with you (by which I mean a 'living' someone). Other times it was much more transparent like what you would see on TV. I never noticed any pattern to their appearance. However, there did seem to be certain rooms where you were more likely to see one or all of them than others. And, conversely, there were rooms where nothing happened (but not many).
2) The dogs were kept both inside and outside, depending on weather. Inside, they didn't walk around in fear or behave differently than normal. BUT, they would bark and become agressive towards things we couldn't see. Remember how they wouldn't go upstairs? Well, onetime I was walking down the stairs and one of the dogs was at the bottom. It was squared off at the bottom of the stairs, growling up at me, with its teeth shown. Really bothered by something. I moved back from the staircase and the dog still focused on one area and wasn't concerned with me. That kind of stuff. And NO, to my knowledge the dogs never came upstairs. They didn't seem to care for that end of the house.
3) If one of the spirits frightened me more, it was the old lady. Just because of appearance. She was little and old. I mean really, this is the kinda shit you see on the Exorcist. Their didn't seem to be any facial expressions. It was almost like a zombie (for lack of a better term). They just moved through the house with no facial expression, no blinking, no sign of emotion at all. When the lady was on the back of my chair, I did not see her. When my sister froze, I got up to ask her what was up and that's when she told me. When I had turned around the lady was gone.
4) To my knowledge, all our (me and my siblings) experiences occurred within the house. The dogs never acted out of the ordinary in the yard. HOWEVER, the girl who's family lived in the house before me told me a story (after my encounter) of her and her father camping out in the yard. In the middle of the night they had the same experience with hearing the heartbeat, except outside and not inside. I had not talked to her about my experience with hearing the heartbeat prior to her telling me this.
5) There was a time when I was angry with my parents over this. I'm not anymore, but I am still confused why you would ignore such a thing and not listen to what your children have to say. Ignoring this will not cure it. I don't harbour any resentment. Mostly because it isn't healthy. My brother and I will still talk about it occasionally. We recount the different experiences, but for the most part it isn't discussed. My parents do not acknowlege that anything happened. It would be foolish to think they didn't have their own encounters.
The nightmares I have about this stuff are specifically about THAT house and not ghosts in general. Many times these dreams are memories resurfacing and are vivid in detail. I really can't say if these dreams will ever subside, but my memories of what happened will not be forgotten.
We never really tried to communicate with the spirits. Probably because we were scared shitless. We did grow accustomed to having them in the house and even gave each a name. Regardless of how used to having them around you become, it doesn't ease your fears when your woken up with whispers, physical contact, or someone watching you from your doorway.
Big Bair