Re: Getting cold feet movein w/ GF
If in doubt, don't. This is your kids lives you are playing with and they are worth more than a half hearted effort.And don't have step siblings share a bedroom, it will be a recipe for disaster, so not fair on them.
We took a couple of years to plan doing this and even still there are issues that come up. We now have one of the older kids wanting her partner to move in next year. We built a much bigger home, 5 bedrooms, 3 big living spaces, study, library and triple garage. There is plenty of space for all of us to either be together or off doing our own thing when we have visitors. Everyone has to help in the running of the household and we have some very firm rules, mainly around treating each other with respect.
You are either all in on this or don't do it.