Dominga Raguindin Costales was born on December 16, 1931, in Villasis, Pangasinan, Philippines. She was married to Ramon E. Costales who was a former Mayor of their town and together, they had eight children. She is survived by her five sons and one daughter. Having graduated from Philippine Normal University with a degree of Bachelor of Science in Elementary Education, she served the Department of Education in the Philippines as a teacher for 35 years. Outside teaching, she also enjoyed cooking, baking, and gardening. As a devoted Roman Catholic, she served as lector in her hometown's Parish, St. Anthony Abbot, and was a member of the Catholic Women’s League and Apostleship of Prayer.

She is going to be most remembered for being a loving and doting inang and lola to her children and grandchildren, and a kindhearted person to her relatives and friends.