Help me buy a new family computer

Since I was little I loved playing on my Wii, but as time went by it started to get old, and not much fun anymore. Then I got gifted a work computer from my uncle (We cant really afford expensive gadgets), but its not really good. I loved playing games on it even thought it wasnt made for that. Lately I have been discussing with my dad about getting a more powerful computer, but his face wasnt a happy one. Im saving money since i was 9, and I really want one. I'm 14 now and I'm afraid I wont be able to buy one for the next few years. Please help me raise funds to buy one. It will help my entire family.