Welcome to the forums! Glad that you would ask such advice for a relatively large project.
Before answering any questions in detail, we will need some details from you.
Most important detail is: what is the house like now? Single floor, basement or not, size, construction method and materials, etc.
Next important: what needs to change? Add onto existing structure, tear down and rebuild, or something in between? Is the existing layout acceptable, or will the floor plan need to be altered? It sounds like more people will be moving in.
Then comes the budget and time frame question: do you plan on spending lots of money (and time) up front and completing the entire project more quickly, or spending less up front and completing less important parts after moving into the home?
Feel free to write a little novel about the quest you are about to embark upon. The more information you include early in this thread, the better. Besides concrete facts, please elaborate on personal (or family) preferences as well. There are many building professionals here that can help lead you down a path that you and your family can be happy with for many years to come. More importantly, the details you consider now can help you from making mistakes that could set your project back in the long run. There are many ways to complete the work needed, but some methods may suit themselves better for your project. The only way we can know what that is will come from you.
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