Every parent, since the beginning of humanity, has indoctrinated their children.
We pass on our values, and the values of our culture, on to our children. If we didn't, our children wouldn't be able to have productive lives.
Imagine if your children, with their current beliefs and values, were transported into ancient Sparta, or Egypt under the Pharoah, or Iran... they would be completely out of sync with their society and unable to function.
All people in modern culture indoctrinate our children with ideas about equality, independence, liberty. Our shared beliefs about love, and sex, and family, and duty, and freedom... these aren't things we were born with. We believe that the values we are passing on to our children represent universal values... but these aren't universal values. They are values that are specific culture and time.
The only reason we believe that our values (that we are indoctrinating our children to follow) are universal values is because we were well indoctrinated by our parents.