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My Neighbor

My neighbors have a lovely but naughty children. This year He is three years old, but I only know and his name is Mingming. He lives next door to me.
Mingming is very naughty. His mother will take him go out to play, and he will secretly hide when his mother didn't isn't paying attention to him. And he often does some funny things to put make the a person in a distressed situation.However, I feel that he doesn't love like to talk, why do I say that: because I can almost hear his mother taught talk to (Or is she teaching him because he is naughty? If that is the case, you can say "his mother scolds...") him every day, but I have never heard him cry or respond to her.
In fact,_Mingming should call me "aunt,", but every time he sees me he almost always calls me "sister." (I don't know the reason why. Maybe I look seems I'm very younger than the same for my age group.), and He really likes that I hugged him. Of course, I like him too, because he is really a likable and chubby children.

Very nice! PledgedForever's corrections are good, but I wanted to give you some more options.

NOTES:
"...look young for your age" is a common phrase in America. You can switch it up if you want. "I seem young for my age group" is fine, too.

The conjunction "in fact" is a little odd at the beginning of your second paragraph. "In fact" has a similar meaning to "but truly" or "but really." You should present the fact that Mingming calls you "sister" first, you can then say "I don't know why. In fact, he should call me "aunt" instead."

Whenever Mingming sees me, he almost always calls me "sister." I don't know why. Maybe I look young for my age. In fact, he should call me "aunt" instead.

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My neighbor

My neighbors have a lovely, but naughty children. This year he is three years old, but I only know his name, which is Mingming. He lived (He lives=present tense) next door to me.
Mingming is very naughty. When his mother takes him to go out to play, he will secretly hide when his mother didn't isn't paying attention to him. And he often does some funny things which can put a person into a distressing situation. However, I feel he doesn't love to talk. Why do I say that? Because I can almost hear his mother taught teach him every day , but I have never heard him cry or respondse to her.

Infact, Mingming should call me "aunt", but everytime he saw sees me he almost calls me "sister" (I don't know the reason for this. Maybe seems I'm seemingly very much younger than the same age group I'm in)

(Maybe I'm seemingly much younger than the others in my age group).

He (Mingming) really liked that I hugged him.

(Present tense: Mingming really likes that(when) I hug him.)

 Of course, I like him too, because he was is really a likable and chubby children(<--plural) child.