Noun
The father of one's husband or wife; -- correlative to son-in-law and daughter-in-law.
Source: Webster's dictionaryfather in law
According to this record, Ong Sum Ping didn't become Sultan, but his daughter was married to the Sultan, and he became the Sultan's father-in-law. Source: Internet
Although Tacitus is usually considered to be the most reliable author of this era, his views on Domitian are complicated by the fact that his father-in-law, Gnaeus Julius Agricola, may have been a personal enemy of the Emperor. Source: Internet
Carter was preceded in death by his mother, Hilda Yvonne Thompson Carter, his wife, Christina Marie Sweat Carter, and his father-in-law and mother-in-law, Dan Alton Sweat and Mattie Lou Varnadore Sweat. Source: Internet
A repeated pattern has been an imperial son-in-law under the influence of his powerful non-imperial father-in-law. Source: Internet
A theory developed by Cornelius Tiele in 1872, which had proved influential, and still held in regard by modern scholars, argued that Yahweh was a Midianite god, introduced to the Israelites by Moses, whose father-in-law Jethro was a Midianite priest. Source: Internet
Alf and Mike also attended the World Cup together and Mike was protective of his father-in-law. Source: Internet