In my opinion, it's the love they show for you.
My own dad (I'm 15) goes to work everyday even if he dislikes it to provide for my family, when he can't afford things he will go around in beaten up clothing to let my sister and I have nice clothing, he always goes out of his way to tell us how much trust faith and pride he has in us, and he always says "Have I told you I loved you today?"
My mom is the same way.
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