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に居たの

were … at

→ に
phrase Rare #25,995
were … at Used in casual questions to ask whether someone was at a place; の gives the question a conversational, often confirming tone.
JA: 昨日、家に居たの？
EN: Were you at home yesterday?

あなたもそこに居たの？

Were you there too?

叔母のところに居たの

I was at my aunt’s place.

— 動くな、死ね、甦れ！ (1990)

君もボストンに居たの？

Were you in Boston too?

本当にボストンに居たの？

Were you really in Boston?

アブラァムは収容所に居たの？

Was Abraham in the camp?

— 動くな、死ね、甦れ！ (1990)

クファリアットに居たの

Were you in Kfaryat?

— 灼熱の魂 (2010)

今日、トムは学校に居たの？

Was Tom at school today?

どこに居たのさ？

Where have you been?

— ソング・オブ・ザ・シー 海のうた (2014)