This is the 2405th most frequent Russian word.
отцом
The Russian word "отцом" is the instrumental case of "отец," meaning "father."
In this sentence, 'отцом' is used to indicate the role or identity of someone as a father of children.
Сергей стал отцом двух замечательных дочерей.
Sergey became the father of two wonderful daughters.
'Оцом' is used here as a possessive noun to refer to one's father, emphasizing respect and achievement.
Я горжусь своим отцом, он многого достиг в жизни.
I am proud of my father; he has achieved a lot in his life.
Here, 'отцом' denotes the role of the person as a parent actively participating in their child's life.