Why does the kitchen sink back up at night?

The kitchen sink backs up almost every night. It is fine during the day. There is no problem with any of the other plumbing. This started about a year ago when my brother changed the faucet on the kitchen sink. Is there a connection? Also my mom is so cheap she doesn’t like to run much water. Everything is soapy and greasy all the time. Could it be soap and grease accumulating in the pipes all day?

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