There is a famous story about the Bach who, when the Taz was about to marry the Bach’s daughter, told the Taz that the Mitzvah of Kaveid es Avicha V’es Imecha applies to a father-in-law… and a mother-in-law.
There is a famous story about the Bach who, when the Taz was about to marry the Bach’s daughter, told the Taz that the Mitzvah of Kaveid es Avicha V’es Imecha applies to a father-in-law… and a mother-in-law.