وَأَصْلِحْ لِي فِي ذُرِّيَّتِي إِنِّي تُبْتُ إِلَيْكَ وَإِنِّي مِنَ الْمُسْلِمِينَ
Wa aslih li fi dhurriyyati inni tubtu ilayka wa inni minal-Muslimin
And set right for me my offspring. Indeed, I have repented to You, and indeed I am of the Muslims.
"Aslih" — rectify, set right, fix. This du'a acknowledges that your children may have problems you cannot solve — behavioral issues, spiritual crises, worldly difficulties. You ask Allah to fix what is broken in your offspring. And the tie to repentance is deliberate: your own tawbah purifies the soil in which your family grows. A parent's spiritual state directly affects their children.
Related Du'as
رَبِّ لَا تَذَرْنِي فَرْدًا وَأَنْتَ خَيْرُ الْوَارِثِينَ
My Lord, do not leave me alone with no offspring, while You are the best of inheritors.
Sahihرَبِّ هَبْ لِي مِن لَّدُنكَ ذُرِّيَّةً طَيِّبَةً ۖ إِنَّكَ سَمِيعُ الدُّعَاءِ
My Lord, grant me from Yourself good offspring. Indeed, You are the Hearer of supplication.
Sahihأُعِيذُكُمَا بِكَلِمَاتِ اللَّهِ التَّامَّةِ مِنْ كُلِّ شَيْطَانٍ وَهَامَّةٍ وَمِنْ كُلِّ عَيْنٍ لَامَّةٍ
I seek refuge for you both in the perfect words of Allah, from every devil, every venomous creature, and every envious evil eye.
Sahihاللَّهُمَّ إِنِّي أَسْأَلُكَ خَيْرَهَا وَخَيْرَ مَا جَبَلْتَهَا عَلَيْهِ وَأَعُوذُ بِكَ مِنْ شَرِّهَا وَشَرِّ مَا جَبَلْتَهَا عَلَيْهِ
O Allah, I ask You for her goodness and the goodness of what You have created in her nature, and I seek refuge in You from her evil and the evil of what You have created in her nature.
Hasan