Which is grammatically correct?

[Anonymous]

1. My sister and me

2. My sister and I

[God_of_Thunder]

That would depend on where in the sentence it appears.

If it's at the beginning of the sentence (the subject), it would be "My sister and I."

"My sister and I went to the movies."

If it falls in the middle/end of a sentence (the object), it would be "my sister and me."

"Our mom made lunch for my sister and me."

[abc3643]

That depends on how that phase is being used.

"My sister and I bought tickets to the concert."
"My friend Sue went to the concert with my sister and me."

[purplepoppy]

Both are. But unless we know the full sentence we can't say which is correct.

My sister and I went to the shop. Correct.
My sister and me went to the shop. Wrong.

Take a photo of my sister and me. Correct
Take a photo of my sister and I. Wrong

If in doubt consider using we or us.

[Guy13]

I would use My sister and I went to the store.

[HighValue]

Number 2 is correct. "My sister and I."

[TadCurious]

Correct: My sister and I went shopping.
Correct: The man gave the dog to my sister and me.