関係が

the relationship; the connection, be involved in; be relevant to

→ 関係
phrase Common #3,168
the relationship; the connection 関係 means a link or relationship between people or things; が marks it as the subject.
JA: 彼らの関係が永続的なものになればよいと思う。
EN: I hope their relationship becomes lasting.

その問題は私よりも君の方と関係が深い。

That issue has more to do with you than with me.

だが このレコードと その話に どういう関係が?

But what does this record have to do with that story?

— 海の上のピアニスト (1998)

彼の失敗は性格と関係がありそうだ。

His failure seems to be related to his personality.

野球と関係が?

What does it have to do with baseball?

— フィールド・オブ・ドリームス (1989)

phrase Rare #36,900
be involved in; be relevant to Usually followed by ある or ない to say that someone or something is involved or relevant.
JA: 彼はその事件に関係がなかった。
EN: He wasn’t involved in the case.

あなたに関係が?

What does it have to do with you?

— サスペリア (1977)

あんたに関係が?

What does it have to do with you?

— シカゴ (2002)

彼はその事件とは全然関係がなかった。

He had absolutely nothing to do with the incident.

彼はその事件に関係がなかったようなふりをしている。

He is pretending as if he had nothing to do with the incident.

身元など今更 関係が?

What does your identity matter at this point?

— イングリッシュ・ペイシェント (1996)