YOU SAID:

I have a dog named Shadow and a brother named Sebastien

INTO JAPANESE

シャドウという犬とセバスチャンという兄弟がいます

BACK INTO ENGLISH

There is a dog named Shadow and a brother named Sebastian

INTO JAPANESE

シャドウという名前の犬とセバスチャンという名前の兄弟がいます

BACK INTO ENGLISH

There is a dog named Shadow and a brother named Sebastian