The i'tikaf (spiritual retreat in the mosque) of one who leaves without his parents' consent

Question:
He says: Honorable Shaykh, may Allah grant you success, if the one in i'tikaf (spiritual retreat in the mosque) goes to his place of retreat without his parents' consent, is his i'tikaf (spiritual retreat in the mosque) valid?

Answer:
If his parents need him, then dutifulness to them is obligatory and i'tikaf (spiritual retreat in the mosque) is a recommended practice (sunnah), so he should not perform i'tikaf (spiritual retreat in the mosque). But if they do not need him and there is no harm to them in that, then he should try to reach an understanding with them, make them happy, and perform i'tikaf (spiritual retreat in the mosque). He should not have any quarrel with his parents, if possible.