I'm not going to share my food with my family
Why don't you want to share?
It's my food, and it is so tasty I want it all for myself.
That isn't very nice. It's nice to share food with your family if they need it too.
They can help buy the food next time then.
Well you should share with them and you can bond with your family. How about a spaghetti night? It is pretty cheap and tasty.