Sunan Ibn Majah Book 34, Hadith 37
"I heard the Messenger of Allah (saas) say: 'The supplication of a father reaches the Veil (i.e. the place of repentance).'"
the Messenger of Allah (saas) said: "There are three supplications that will undoubtedly be answered: the supplication of one who has been wronged; the supplication of the traveler; and the supplication of a father for his child."
'Abdullah bin Mughaffal heard his son say: "O Allah, I ask You for the white palace on the right-hand side of Paradise, when I enter it." He said: "O my son, ask Allah for Paradise and seek refuge with Him from Hell, for I heard the Messenger of Allah (saas) say: 'There will be people who will transgress in supplication.'"