Supplicate for your parents during Taraweeh and Tahajjud

Shaykh Ibn `Uthaymeen( رحمه الله) said: "Your supplication for your father (i.e., both the parents) in Taraaweeh or Tahajjud is much better than you sacrificing ten camels on his behalf (in charity)." [Liqa'a Al-Baab Al-Maftooh]