Are we rich

My son asked me this question the other day: "dad, are we rich or poor?" I was surprised by the question: "why do you ask this question, my son?" My son is only a second grader. Growing up in China, I remember when I was his age, I did not have any concept of wealth. We were all equal, equally poor in materials, but equally abundant in spirit.
"Well. My friend (name omitted) told me his dad is a millionaire. A million is very rich right? How much do you have, dad?" I have tried very hard to free my children from thinking in materials terms at this young ages. But I think I failed. The school and the environment we live in have more influence on a child than anyone can have. He has already started to notice what kind of cars people are driving (thank you TV commericials. That is why we rarely watch any TVs. Kids only watch PBS around my house!), what kind houses people live in.
How much do I have? That makes me ponder. What makes a person rich? Is it really the numbers of zeros behind a digit that a person has in his/her bank account? Is rich only defined in monetary terms?
"I may not have a million dollars, son. But we are very rich! Remember, son, we are very rich, becuase God has made us rich." I said to my son.
"He has?" My son was in doubt.
"The Lord is my shepherd. I shall never be in want. Son, you have all the things that you need, your clothes, your food, a nice house, love from your parents, and much much more. Aren't we very rich?"
"I guess you are right, dad." My son is semi-convinced.
How can I convince you my son. I even need to convince myself about what I just said, so that I would not be a person driven by money, but driven by the desire to glorify God in whatever I do.
I hope my son will understand this. Because I know in my personal experience that happiness can not be obtained from material possessions. Happiness is a state of mind, a sense of satisfaction, gratitute, and hope for better future.
We are rich, very rich in deed.