Side hustle culture has led to an explosion in bootstrap entrepreneurs. But as their business ideas and ambitions grow, they are turning to the "Bank of mum and dad" for angel investment into their start ups. Wealth managers are increasingly navigating capacity for loss risk at a multi-generational level.

The bank of mum and dad has a huge part to play in funding many UK startups. As many as 20 percent of businesses are funded by inheritance, and a further 19 percent by parents, acc...