兄と

with my older brother

→ 兄
phrase Uncommon #10,877
with my older brother と usually marks someone accompanying an action; with 間違える, 兄と means “for my older brother.”
JA: 兄と映画を見ました。
EN: I watched a movie with my older brother.

私を兄と勘違いしていたみたいですね。

It seems you mistook me for my older brother.

私は子供の頃、兄とよく川へつりに行った。

When I was a child, I often went fishing at the river with my older brother.

私は兄とテニスをしました。

I played tennis with my older brother.

兄と映画に行きました。

I went to the movies with my older brother.

彼と彼の兄とは見分けがつかない。

I can't tell him and his brother apart.

誰もが私を兄と間違える。

Everyone mistakes me for my older brother.

私は昨日、兄と喧嘩をした。

I had a fight with my older brother yesterday.

ずっと兄と行ってたんだが

I’ve always gone with my older brother, but…

— レザボア・ドッグス (1992)

ある日、私は兄と走っていた。

One day, I was running with my older brother.

ジェーンは兄とテニスをしているかもしれません。

Jane might be playing tennis with her older brother.