I’m a stepfather, and any step parent that treats biological kids differently than step kids is a piece of shit.

I know of a wealthy family who own a mid-sized company and referred to a second wife of one brother as a “newcomer” for close to 20 years. They did everything in their power to minimize the wealth she and her kids got when he tragically died.

They were still pretty well-off, but not super wealthy. There can be really complicated dynamics around family money, so it could go either way.