Good-day to you Kristie, 

I believe you are living in or very close to a spirit portal. I myself had a home which had such a phenomenon. Sometimes the spirits were positive and other times manifestations became frightening. The reasons why I am nearly convinced (I would have to be in the actual location to be more certain) that you are near a spirit portal is that your seeing and sensing many different ghosts from different historical periods. As well as I would guess you've sensed male, female, young and old ghosts as well. Basically you are in the middle of spirit traffic. Parapsychologists and "sensitives" such as myself have tried to figure out how this anomaly occurs. That is to say, how the portals are actually created and how they are able to persist after many years. I know a few things about portals that may be of interest to you. Spirits coming in and out of your portal (assuming this is for certain) can be from your property (prior inhabitants) but there will also be spirits from outside your property (perhaps miles from your home). It would seem a portal is a sort of magnet which attracts and transports spirit energies. According to my spirit guide, there are many types of portals. Some are for higher spirits (ones who've crossed over properly) and other portals serve lower spirits (ones who are confused and remain trapped). I believe you have a lower portal near your home, since manifestations for you and your family tend to be not so positive. I assure you spirits from the higher portals would never cause harm or wish to create fear. So we can assume you are experiencing varied spiritual traffic from a lower/earthbound plain. 

Also apparently, portals are said to be made stronger by the presence of adolescent energies, psychic persons, negative emotions and locations were traumatic events have occurred. The theory is that such powerful human energies create a rift or rip into time and space by which certain energies may then travel. It's like a ghost highway really. 

To rid of a spirit portal is very difficult unfortunately. From what I've researched, portals may last hundreds of years but eventually they wear out all by themselves. I do not know why this occurs but we can suppose that all energy must eventually dissipate and so a portal made of energy should by all logic wind down. I suppose you can ask yourself whether you wish to wait for it to dissipate on it's own. But I doubt very much your into that idea. I wouldn't be keen on that idea either. I certainly do not blame you, life can be very difficult when you do not feel comfortable in your own bed at night and when you feel you don't really have privacy even if you are physically alone in a room. I sympathize with you and your family sincerely. 
There is a little good news though. There are a few things that we the living a can try to do to ease the presence of spirits in a home and to perhaps bring the disturbances down to a livable minimum. Unfortunately, I believe that your portal might be there for quite some time. Attempting to close it can be downright tricky and requires much patience and perseverance. Keeping that in mind at the end of your many attempts you still may be hearing bumps in the night. Much like the living, the dead don't always listen. So you'll have to be very clear about your feelings and intentions. 
Here are some quick pieces of advice which I will list off. Please do not hesitate to email me again to clarify. 

Try a do-it-yourself clearance or cleansing first. You are just as powerful as any priest/priestess and don't let anyone tell you differently. We all have spirit guides so ask them to join you during your clearance. It's also your present home and you are in your right place (the spirits are not) so remember you have full justification in getting rid of them. So firstly, create a boundary that spirits must go around and not through. Take anything you'd like. A smudge stick, a burning stick of incense or merely your hand and trace the walls of your home feeling during this that this is your property and no one else's. Infuse your energy on the walls. Create a boundary within your home. Every ten feet or so say you are closing this area off to every spirit accept spirits from the light. Ask you guides to enforce the rule. Ask them to help you rid of unwanted spirits when they try to enter your space. If you are not close to your spirit guides then I advise you to become close to them through any means really such as talking to them or praying. You see your spirit guides cannot do anything against your will. You must ask them to be protective. You only need to ask them once. Do this and you may notice a decrease in personal ghost contact. You may not rid of the portal completely but it may be limited to other areas just not in your home. 

Try to lessen stress in your home environment. Stress and worry will only make the ghosts more interested in you. Try meditation, prayer and exercise a maximum in positive thinking. 

Do not ask a ghost to make itself known or to show itself. Do not use a oujia board. This, as you probably already know will most likely make manifestations increase. 

Ask the universe, God or whatever you believe to be the benevolent force to cleanse you home and to rid of the portal. You will have to be persistent in this request. I myself have learned that petitioning over time works a lot better. Also if you should have any deceased relatives, ask them as well to help you cleanse your home. Employ a lot of helpful, positive spirit energy. And don't forget to thank them. :) 

When you feel a ghost is near immediately tell it to leave. Also tell it never to return. Make sure it does not feel welcome. If you feel the ghost is friendly (like a harmless child spirit) then try to tell it, it is no longer alive and that its family is waiting for them beyond the light. (They'll know what you mean by the light since my guide tells me that the spirits on the otherside are constantly trying to have them cross over, but the ghosts are afraid or what have you). 
I hope this has been helpful Kristie. I was wondering if you'd mind me posting this email along with the photos on my webpage? I will include your email (not your home address for your privacy) so perhaps others can send some advice as well. 
So, be persistent and try a combination of things. Good luck! If nothing happens then moving may be an alternative for you. 
Just know that there are good forces that can work to help you but you have to ask them first. 
I will be around should you need more advice. Please update me in the future, I'd be very interested to see how things went. 
In the meantime, perhaps you could start a website to post all those interesting photos? Try to get some EVP as well, that may give you a clearer idea of what your dealing with. 

Take care of yourself and your family. 

Sincerely, 
Christine Delaney 
(webmistress of Where Ghosts Do Dwell)