National Mother-in-Law Day in USA
National Mother-in-Law Day in USA is held on October 26. Celebrated on the fourth Sunday in October. This event in the third decade of the month October is annual. 
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Modeled on the celebration of Mother's Day and Father's Day, Mother-in-Law's Day was first celebrated on March 5, 1934, in Amarillo, Texas, where it was initiated by the editor of the local newspaper. The observance was later moved to the fourth Sunday in October.
Similar holidays and events, festivals and interesting facts
International Day for the Protecting Men's Nervous System From Women's Violence on October 22
Australian Grandparents Day on October 26 (Last Sunday of October);
Grandmothers and Grandfathers Day in Ukraine on October 28 (Grandparents Day since 2018);
Grandchildren and grandparents Day in Russia on October 28 (a holiday for the whole family);
Girl Scouts Founder's Day on October 31 (United States);
Movember begins on November 1
Mother's Day in East Timor on November 3
World Men's Day in Germany on November 3