A mother and child are One initially and slowly the child acquires a body of its own and control of that body… all this delights a mom. It also acquires a mind of its own and starts having its own tastes, likes and decisions.
The child has no memory of being one with the mother and a mother has no future cognition that the child will be separate from her till the child gets back to her with its choice of a spouse.
And then slowly the mothers mind learns to move from advaitam (oneness) to dvaitam (twoness).
At this time if the mother learns advaitam with the original parent the “Tat” instead of with her child… then perhaps that is right?