In relation to what I mentioned about honor of ones parents I wanted to add from Naphtali Troup [חידושי הגרנ''ט] that to listen to one's parents is a Positive command. That it it can not negate a negative with a positive command nor a command that has Karet.
Naphtali Troup is usually considered on the same plane as Reb Chaim Solveitchik and his ideas are commonly cited in Litvak yeshivas.[That is in the חידושי הגרנ''ט which I used to own a copy of. After Rav Shach's Avi Ezri I think it is one of the best books I have read. It has that same quality that you find in Rav Shach of being clear and deep all at the same time. ]