Is the married son obligated to inform his mother of his total income and how he spends it, under the pretext that she raised him after his father's death, knowing that the wife is righteous and helped bring the son closer to his mother, and the mother works and receives a good salary?

The mother's right is great, and honoring her and obeying her in what is good is among the most emphasized obligations. However, it is not among the obligatory acts of righteousness to inform her of all financial income and expenditures. If she insists, one can discreetly avoid the topic with wisdom and veiled hints, without resorting to lies.