Is it permissible for a wife to help her parents with her own money without her husband's knowledge?

If the husband does not stipulate the sharing of the salary for household expenses, then the salary is the wife's property, and she may dispose of it as she wishes without being obligated to ask for permission. However, it is better for her to inform him to reassure him. Helping parents is one of the greatest acts of righteousness and upholding ties of kinship, which increases one's lifespan and blesses one's provisions, as the Prophet, peace and blessings be upon him, said: "Whoever wishes that his provision be expanded for him and his life be prolonged, let him uphold ties of kinship." Therefore, there is no harm in helping one's parents with a portion of the salary without the husband's knowledge, especially if he does not object to it. However, informing him is better.