Mother-daughter team joins YC to accelerate their drug discovery platform
venturebeat.com
venturebeat.com
Sure, family businesses exist but processes are well established, company creation process involved only the parents. Friction is also minimized when the company is large enough to provide separation (i.e. relatives working in different depts/capacities that direct interaction with other relatives is minimized).
I haven't heard the same advice about not getting into business with your family, but I imagine similar challenges arise where you have to be conscious of turning off the business relationship over the holidays, etc.