Do proofread my anecdote

Hallo,

I have been writing anecdote, and I wish you could proofread it. I thank you for time and your corrections

We celebrated Sint. Klaas last saturday along with our loved one.
As usual, Mitchel had made a "things-to-have" list for St. Klaas to have. Since the true existence of Sint has not yet been reaveled to him, he is free to ask anything he covets, but as always I make sure that those he longs for don't deplete my wallet. So I gave him a heads-up about the possibility that Sint would not always be able to deliver all his desire. At first he couldn't fanthom why, cause it is said Sint would have fulfilled all kids requests. But I didn't propose to let him get things overly much, so I painstakingly explained that he shouldn't expect too much from this big white old man. After a minute of two grumbling about it, he eventually nodded in understanding.
He had been talking about Sint and the pressie for the whole week long. And I could tell by the look in his face; his eyes sparkled, a smile flickered across his face, tremour in his voice when he uttered Sint's name, he looked sheer animated, he was at fever pitch as the Sint eve grew nearer.
When he finally received his gifts he was so chuffed with it, he was so over the moon. He told me that Sint always gives what kids heart desire, since he has received one, as if he had said that just to prove me wrong.
The very next morning when I encountered him in his bedroom while he was busing himself unwrap his present, he said eagerly to me; "You know what, mom, kids know about Sint better than you do." I suppose he wanted to point out my mistake one more time, just to make sure that I was defeated now and would never arise again to fetter his will.
Late in the afternoon his father discovered that one of his "old" toy had been broken. I asked Mitchel to clarify the caused, he had given me a theory and had empathically denied any wrong doing. As I wasn't satistified with his explanations I kept grousing about the fact, having his father marched behind every words I said, Mitchel suddenly roused and said; "Oh mom, do stop whining!" and he hastened to add; "Ask Sint for the replacement. He will sent you one, he gave one to my cousin." I found amusement in his remark and exchanged look with his father before his crashed and laughed. I suppose he said that in order to stop me nagging him since I was starting to jangle his nerves.
Shall I get the replacement from Sint? Just a chimera!!!!