Who stole the cookie from the cookie jar?

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Our youngest boy age 6, has become a habitual liar and commits thievery of snacks and small items on a constant basis.
Apparently , according to my research , this is a phase that all children must pass through.
Silly boy is caught every time and is punished by being sent to bed, no snacks for a week, no TV , but still nothing deters him and he lies to our face, even if caught red handed.
It’s odd ,because he is a nervous little fellow ,and you would think he’d want to stay under the radar. Perhaps it is the negative attention he craves.
My boys have taken so many ridiculous items to school in the past, that each morning I search their bags. This morning the littlest bag was jingling with coins.
I asked him where he was taking them and where he got them from. He became very flustered which is usual for him and wouldn’t answer me , again being silent as is his go to.
He eventually told me that he took them from a small bowl I have on the kitchen table.
Stealing is not acceptable in our house and he received a telling off he won’t forget.
Once we were in the car on the way to school I calmly asked him why he took the coins.
His answer ” well there’s a boy in my class called Zachary and his cousin was born with only half a heart and they’re collecting pennies to help him get better”
I felt like crap and told him that all he had to do was ask, and a bag of pennies would be sent to school.
I encourage my children to talk and ask for things but still this phase is a very difficult one and I will be glad when it’s over.
They truly want for nothing and live a very comfortable life.
Why lie and steal? If you want the chocolate cookie , ask for it , you might just get it.