It is so easy to let disorganization and clutter take control of a house. It can be overwhelming. It didn't get chaotic in one day; it won't get cleaned up in one day.
It has to be taken step-by-step. It is important to make a plan on how to get your house organized. Walk through the house and make notes of what needs to be done in each room. Once you have a list, make a goal to complete at least one thing off the list each day. Keep the list where you can see it.
Start with small projects, things you can see improvement in quickly. Try organizing a closet. Sort through it and get rid of things you don't need anymore. You can donate them, get them ready for a yard sale or just throw them away. As you make more room in your closet, think about ways to maximize your storage space. You can add shelves and other closet organizers.
As you move through the list, some projects may take more than a day. That is ok. You just have to make sure you keep working on it till it is done. Take about thirty minutes in the morning and thirty minutes in the afternoon working on your list. Before you know it, you've gone through the entire house and organized it. The trick now is to keep it organized.
Each day, keep up on maintaining your newly organized home. The key is to not get into the "I'll do it later" mindset. If you have something that is in the wrong place, take the time to either put it away right away, or have a designated area on each floor, like a box, to put things that need to go to another floor. Then at the end of the day, everything in the box gets put away.
Another idea to help keep the house organized is to establish a schedule where each room of the house gets a thorough cleaning one day each week. It may take awhile to get in the new routine, but if the family works together, it will be easier. If people remember to put their own things away, that will also help. Try not to be too impatient when people forget at first. Be sure to remind them gently, without nagging.
If you set up a checklist, similar to your original goal list, you can keep on top of the things that need to be done around the house. Why not assign each family a specific area of the house to help keep organized. They simply have to go through the room and make sure that everything is in its place. While it takes time and a bit of effort, it will be worth it once the house is clean, neat and organized.