Yui's grandmother's place with 〜んち

Grammar Explanation: One's house with 〜んち

As the end of the year approaches, Yui and her friends discuss which New Year foods they like and dislike.

結衣(ゆい):: 「おばあちゃんち行(い)くと微妙(びみょう)なご飯(はん)たくさん出(で)てくるよね」; "When I go to my grandma's house, a lot of not-so-good food is served."
さっちゃん:: 「なかなかひどいな結衣(ゆい)」; "That's pretty bad, Yui."
琴葉(ことは):: 「結衣(ゆい)はおばあちゃんち行(い)くのか？」; "Are you going to your grandma's house, Yui?"

「おばあちゃんのうち」 is contracted into 「おばあちゃんち」.