Always serve the people who directly give you money—don’t mess around with those interpersonal relationships.

If your parents give you money, then serve your parents.
If your husband gives you money, then serve your wife.
If your wife gives you money, then serve your wife.
If a rich woman gives you money, then serve the rich woman.
If a customer gives you money, then serve the customer.

Although it’s very realistic, this is the clearest, most efficient, and most correct way to live in the adult world. ​​​