Question

who is the father of brahma ,vishanu ,and shankar god

Answer 1

hey
Brahma, Vishnu, Shankar are unborn. They are 3 expansions of Aadibhagwan Parampurush(卐) the male expansion of genderless Parabrahmañ(ॐ). And Saraswati, Lakshmi, Parvati are 3 expansions of Aadibhagwati Paramshakti(श्री) the female expansion of genderless Parabrahmañ(ॐ).

Answer 2

param barham is the father of Brahma ,vishanu,Shankar god.