Family offices are making more startup bets as venture capital shakes out. Here's what founders need to know.

• Family offices are stepping up to make more startup bets as venture capital scrambles.
• The firms, which quietly make up a third of all startup capital, are now leaning further into VC.
• Experts say family offices are great fits for long-term investments in areas like climate and biotech.

It's been a turbulent couple of years for venture capital. Some family offices are stepping up to pick up the slack.