Okay. This one's a little hard to explain. Rosy the Rascal is NOT the younger Amy Rose. They are two different people. Originally, Sega planned "Amy's" original name to be Rosy. But then, Archie made Rosy the Rascal as the "Anti-Amy Rose" In my opinion, Archie comics ruined the Sonic world, made everything confusing, made way too many characters, and messed up every single character, either physically or mentally.
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I am afraid that there is no character called Rosy palm in Sonic X. There is a character called Amy Rose, though.
She was 8 years old in her debut in Sonic CD, but as of Sonic Adventure (1998) her age has been bumped up to 12.She first appeared (as Rosy the Rascal) in a Sonic manga in 1992.
Amy Rose is a hedgehog.
Yes Amy Rose is made from SEGA.
Amy Rose has not been revealed to have any brothers.