It startles when I use that argument with my kids.
Unlike other parents, I never said, as a kid, "I'm never going to say that to my kids." In fact, when I was a kid, I looked forward to having kids so I could win disagreements with the shere authority of "I said so" rather than the well reasoned hard debated argument.
What actually bakes my noodle is how often I don't use it, that when I do use it, I am very aware of it.
Don't get me wrong, my kids do try to argue their way of out chores or this or that, and they often ask, "Why?" Usually, I naturally give them the reason behind it:
"You are part of this family. We help each other out"
" It is important for grammy, or nonna, or dad, your sibling or somebody."
" Because I am stirring my coffee with a knife." etc
And that usually is enough.
That is why when I have reached the "Cuz I said so" it totally amazes me.
Scripture to keep in mind
Six things there are, which the Lord hateth, and the seventh his soul detesteth:  Haughty eyes, a lying tongue, hands that shed innocent blood,  A heart that deviseth wicked plots, feet that are swift to run into mischief, A deceitful witness that uttereth lies, and him that soweth discord among brethren.  My son, keep the commandments of thy father, and forsake not the law of thy mother. ***Cf:Douay-Rheims Proverbs 6: 16-20
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