How does one deal with obsessive doubts regarding Wudu and prayer, and with parents in daily matters?

A Muslim should strive in supplication for Allah to remove anxiety and grief from him, and to take the means that assist in this. As for obsessive thoughts (waswasah), one must turn away from them and not indulge in them. As for parents, one must honor them, seek their pleasure, obey them in what is right, and treat them kindly in word and deed, for Allah the Almighty says: "And to parents do good."