How do you fix a pc that keeps dropping the network connection?

My little brothers laptop works fine, until my little sisters laptop is turned on. Once her laptop is turned on, his laptops connection keeps going fr

My little brother's laptop works fine, until my little sister's laptop is turned on. Once her laptop is turned on, his laptop's connection keeps going from Connected, to Limited Connectivity, then back. How do I fix the problem?

The Details of the problem:

1. My Little brother's laptop is in his bedroom, which is about 11 feet away from the wireless router.
2. My little sister's laptop is on the desk right next to the wireless router.
3. My little brother's laptop is a gateway laptop. A small one, only about a 5 to 6 inch screen, with Windows Vista.
4. My little sister's laptop is an hp about 17 inches, with Windows 8.

Could the problem be the close vicinity of the pcs?

or:My little brother's laptop works fine, until my little sister's laptop is turned on. Once her laptop is turned on, his laptop's connection keeps going from Connected, to Limited Connectivity, then back. How do I fix the problem?The Details of the problem:1. My Little brother's laptop is in his bedroom, which is about 11 feet away from the wireless router.2. My little sister's laptop is on the desk right next to the wireless router.3. My little brother's laptop is a gateway laptop. A small one, only about a 5 to 6 inch screen, with Windows Vista.4. My little sister's laptop is an hp about 17 inches, with Windows 8.Could the problem be the close vicinity of the pcs?


or:Hello I think the problem is that when you turn the other laptop on the connection Is shared throughout both therefore he will not be getting enough connectivity and that is limiting his uses.

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