Mad Daoist Son-in-law is a Manga/Manhwa/Manhua in english language, REINCARNATION series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

The Head of the Laoshan Sect was attacked and killed by the Demon King. When he was dying, his soul left his body and returned to the modern world after 300 years, His soul possessed the body of a weak man who eats soft rice. Now, he is determined to avenge himself against the Demon King, while also dealing with his mother-in-law......This new life isn't easy...