One's house with 〜んち
Grammar: Colloquial and Casual Speech » 〜んち
The text 「◯◯◯ のうち」 (“◯◯◯’s house”) often gets contracted to 「◯◯◯ んうち」.
If the name ends in ん, that gets contracted in as well: 「◯◯◯ さんのうち」 becomes 「◯◯◯ さんち」.
A lunchtime conversation about recent jewelry store robberies gives way to talk about jewelry and the kinds Usagi and her friends would like to own. 「なるちゃんのうち」 is contracted into 「なるちゃんち」. Sacchan and her friends decide to make a movie about the district they live in. They stop by Sacchan’s mother’s shop to film a scene. 「うちのうち」 is contracted into 「うちんち」. As the end of the year approaches, Yui and her friends discuss which New Year foods they like and dislike. 「おばあちゃんのうち」 is contracted into 「おばあちゃんち」.Examples
Naru's place with 〜んち

Sacchan's place with 〜んち

Yui's grandmother's place with 〜んち

Supplemental Examples