0 used to refer to a person's parents, considered as a place from which the person can get money:
The cheapest way to get around waiting for your loan to arrive is to borrow from the Bank of Mum and Dad.
Some first-time buyers are lucky enough to be able to turn to the Bank of Mum and Dad.
NYA ORD
European
May 10, 2021
DAGENS ORD
Shimmer
Bank of Mum and Dad