Reference: http://www.alfawzan.af.org.sa/node/15374
Question: [O] Noble Shaykh Saalih, do you have any word[s] of guidance to the one who is disobedient to his parents, especially the mother. [I ask] since I am suffering from the disobedience of my daughter for more than ten years; she has not telephone [me], and I do not know anything about her.
Response: Disobedience [towards the parents] is [a] grave [sin] from the major sins; it follows [on in order of severity] after shirk – because it is the right of the parent, which comes after the right of Allaah:
…as mentioned in many [other] aayaat. So disobedience [towards one’s parents] is [a] grave [sin] from the major sins, and it is obligatory upon the child – whether male or female – to repent to Allaah if they are disobedient to their parents, and to return to honouring [and respecting] their parents and seek forgiveness from them for what has [come to] pass from them [towards their parents].