Imam Ali (AS) narrated from the Prophet of Islam (PBUH) who said:

“Be careful about Father’s Dua which is an acceptable Dua and is not rejected; it is a Dua that Allah (SWT) pays attention to and says: Bring it to Me (God) to grant it. Therefore, be careful about father’s Dua which is sharper than the sword [1].” When a Dua is sharper than the sword, it means that it can be for the benefit of children or God-forbid can also be against them.

[1] Navader-e-Ravandi, Page 92.

Source: en.shafaqna.com