my new guinea pig is aggressive at my old guinea pig?

so i have one guinea pig (brownie) who is a sweet 9 month old cutie, but today i bought a new guinea pig (cookie) and the lady said hes about 9 weeks old. when i came back from the pet store i put them on my bed and tried to introduce them but when i did cookie's hair was rising and they were both chattering their teeth i know that is bad but what should i do to make them like each other.
P.S. My parents told me i have to give one away and i cant because it just breaks my heart so plz help me!!!!!!!!!!!!
 
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