Examples from the Web for in-law
He wants to be surrounded by his family, his children, his in-law children, and his doctors, with whom he is extremely close.Peter Goodwin Is Dying: An Assisted-Suicide Doctor Invokes Law He Built|Casey Schwartz|March 4, 2012|DAILY BEAST
My mud'-in-law she is de devil for prayin', an' she is poody stout, po' t'ing!
"The doctor's bull-dog is an 'in-law,' too," laughed Mrs. Smith.Ethel Morton's Holidays|Mabell S. C. Smith
Any man dat will telegram a message to save his rich mud'-in-law from maybe sudden apoplexy, he is one saint, sure!