I have an elderly friend who has been used to living in some rather nice houses over the years. Her husand was a jobbing builder when they married and he then formed small building company with his brother and cousin. It helped that another older cousin was already a successful local architect. There’s a world of difference in being a builder if you have to pay a huge amount to engage an architect. Having one in the family can bring much greater success in that there’s a natural family understanding and a combining of thoughts. Very often siblings work very well together too – in design and decor, there is a general appreciation of the project finer points and it’s as if they work with one mind. Again with projects one can concentrate on the design side and the other on the build requirements or one can design a thme and the other will be good at procuring the actual product to bring it to fruition.