Having good children is 50% prayer and 50% shalom bayis.  ~ The Steipler Gaon

Note that the Shalah Hakadosh identifies three places in the morning tefilos where one should specifically daven for his or her children:

• The first bracha of Birchos HaTorah by Vinihiyeh Anachnu Vitzetzueinu…
• In Ahava Rabba – Avinu HuAv Hurachaman…
• In Uva Litzion, toward the end, where it states Liman Lo Neega Lareek, ViLo Naylaid Labehalah.