Co-Founder Dynamics: Evaluating Contributions. I will not promote.

Hey guys, I need input regarding our startup's co-founder dynamics. We have four co-founders with near-equal equity: three at 20% each and one at 30%, with 10% reserved for future hires and investment. Each co-founder has a distinct role - growth and product, sales, another is technical, and our CEO focuses on fundraising. Key questions I'm grappling with: 1. How should we measure and evaluate co-founder contributions given our different roles? 2. What's the appropriate stance on co-founders maintaining side projects? One of the co-founders pushing that no side projects should be allowed. 3. Should contribution assessment be based on effort, impact, time invested, or some combination? 4. One co-founder (single, no hobbies) argues that those with families/kids might not contribute as much. Should we factor in personal circumstances when evaluating effort, or should expectations be uniform? Product we building is in a finished MVP form, all bootstrapped, some customers. Looking for concrete frameworks to approach these governance questions. Or maybe personal anecdotes from your experience.