“If there is anyone who curses his father or his mother, he shall surely be put to death; he has cursed his father or his mother, his bloodguiltiness is upon him.” [Leviticus 20:9]
I believe the above verse is very clear and need no further elaboration. Some people might argue that we are of the new covenant and not under the OT Law. I do not dispute that but do not forget the above commandment shows the standard of God and His expectation of how children should behave towards their parents. I believe that expectation still holds.
The good news is, beside the stick shown in the verse above, there is a carrot as shown below.
“Children, obey your parents in the Lord, for this is right. HONOR YOUR FATHER AND MOTHER (which is the first commandment with a promise), SO THAT IT MAY BE WELL WITH YOU, AND THAT YOU MAY LIVE LONG ON THE EARTH.” [Ephesians 6:1-3]