please don't try to have him be there for every single episode, it'll be weird if he is. the first 5 or 6 chapter were the best and they were your original, so don't be afraid to do your own thing.
great chapter, good way of writing the characters and their personalities, along with interesting logic and plot. This is the best modern family fanfic I found.
Are you going to make him move? I think it's cool if he stays and interacts more with the family, but for him to move out and then come back is a good way for him to be able to have a relationship with Alex or Haley, since they are so young now