I do not recommend using a seven year old as a server for the following reasons.

1. their parents will get mad
2. the neighbors might call the police about all the children you have racked in your basement
3. they have poor computing power, wait until they're at least in their late teens (although software updates come too late and the system is usually very unstable at that time.)
4. think of the smell! your house will smell like a kindergarten
5. food costs are already high enough, add two or four growing kids to that budget and it's far cheaper to run a couple Dell R610s every month.

overall, not worth it mate. good luck though!