I'm currently saving for an iPad for my daughter, and if I save expenses like getting him cheaper items from menus and such I can then put that money towards the iPad. And since she's my actual daughter, I don't see anything unreasonable with prioritizing her first. How can I make him understand this? Because he always seems to feel that he deserves as much as she does.
Read more: How can I make my foster son understand that he doesn't get as much as my real daughter?