The father-in-law seduced his daughter-in-law and called "picking up ashes." Is there any allusion in this?

People call the father-in-law seducing his daughter-in-law "collecting ashes", which has been circulating for a long time and spread all over the country. As for the origin of the word "picking up ashes", there are different opinions, and there are several different allusions among the people.

One rumor is that stealing tin is homophonic with daughter-in-law, implying that father-in-law steals daughter-in-law. In ancient times, tin foil paper was often burned in temples. After a long time, the tin foil accumulated in the incense burner formed a large piece, and the monk peeled it off and sold it. Later, others found out and stole tin from the stove.

Another rumor of stealing tin is that when folk tin makers make tin cans, they will scrape off more tin and hide it in the ash. Then if you want to steal these tin materials, you have to scrape the dust off them. This is also stealing tin. Some honest craftsmen despise this kind of tin stealing. Picking ash is stealing tin, which is homophonic with daughter-in-law, and it is extended to father-in-law stealing daughter-in-law.

There is a folk saying that the daughter-in-law used to clean the ash under the stove, which is called "picking ash". If the father-in-law wants to have an affair with his daughter-in-law, he will hide gold and silver jewelry in the ashes of the stove to "bribe" his daughter-in-law, or hide love letters and love poems to seduce his daughter-in-law. When the daughter-in-law picks up the ashes, she will know what the father-in-law has hidden. If the daughter-in-law is interested in her father-in-law, they hook up.

There is also a folk saying that scraping ash requires bending down and kneeling on the ground, soiling your knees. Knees are homophonic with daughter-in-law. A dirty knee is a dirty wife. My father-in-law has an affair with my daughter-in-law, which means that my father-in-law has defiled my daughter-in-law. This is obvious.

"Picking up ashes" in A Dream of Red Mansions is also called "crawling ashes". Jiao Da of Ningguo Mansion swears after drinking: "Stealing dogs and playing with chickens and climbing ashes at home every day." . Jiao cursed climbing the ashes, that is, Jia Zhen had an affair with his daughter-in-law Qin Keqing, and was later discovered by You Shi.