Екатерина was born on October 31st, 1901 and her christening took place on November 30th, 1901 in Попадьино. Her godfather was Григорий Яковлевич Цыплеев and her godmother was Матрона Павловна Захарова. Екатерина's father was Пётр Васильевич Поликашин and her mother was Евфимия Сергеевна Цепляева (Поликашина). Her paternal grandparents were Василий Поликарпович Поликашин and Домна Федосеева (Поликашина). She had a brother named Яков. She was the younger of the two children. She died at the age of 4 on November 28th, 1905. She was buried on November 30th, 1905 in Попадьино.