VC reactions to sibling co-founders

In startups, choosing a co-founder is often compared to choosing a spouse. But what happens when your co-founder actually is family?

In this episode of Build Mode, host Isabelle Johannessen explores how founders navigate co-founder relationships that come with built-in trust and unique challenges. First up is Hala Jalwan and Alessio Tresanti, the married co-founders of AI agent for procurement focusing on autonomous sourcing, Rivio. They discuss building a company from the same household and why clear roles and communication matter when both your personal and professional lives are on the line.

Then Isabelle talks with Anna Sun, co-founder of Nowadays, an AI co-pilot for corporate event planning that she launched with her sister Amy shortly after graduating from MIT. Sun explains how their sibling dynamic shapes decision-making, team culture, and the way they move quickly as founders.

They discuss:

• How trust shapes strong co-founder partnerships

• The benefits and challenges of building a startup with family

• Dividing roles and decision-making between co-founders

• Hiring and culture in early-stage startups

• Why some founders turn to co-founder coaching to navigate conflict

This episode looks at how unconventional co-founder relationships can become a startup’s biggest advantage and why trust may be the most powerful tool a founding team has.

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New episodes of Build Mode drop every Thursday. Hosted by Isabelle Johannessen. Produced and edited by Maggie Nye. Audience development led by Morgan Little. Special thanks to the Foundry and Cheddar video teams.