The relationship with your family members is will alter once you become your own boss. The income you receive will not be as regular as before but hopefully will be more. In the interim you may need to survive on your spouse’s earned money. You need to know if that is enough for your family. Depending on your business you may be working longer hours than before or you may be working substantially less. Both these scenarios need to be considered. For sure though your working hours will be irregular.
Many things will affect your family relationships not least of which will be the risk that you are taking by leaving your job and going it alone. Make sure you talk all these things through. They must be behind you, this is an important factor in your future success.