I agree with Attahaas. Tier 1 Entrepreneur visa (if not accelerated route) is formed of 2 parts: the first 3 years and 4 months, and another 2 years of extension. But both parts are Tier 1 E visa == this visa says "no employment except working for your own company or as a sole trader", means you can ...

See this: https://www.gov.uk/tier-1-entrepreneur/family-members

Point 10: Family members.
Easy to understand.