The advise from our grandparents have no use for their grandchildren because the world changed a lot during the past 50 years

Sentence: Grandparents are inclined to kindly and warmly educate us, as they they wish us to become excellent in the future and even become the glory of the whole family, and sometimes they are more eager to guide the kids than the parents.
Description: A pronoun, personal, nominative, not 3rd person singular is not usually followed by a pronoun, personal, nominative, not 3rd person singular
Suggestion: Refer to they and they

Sentence: For one thing, the main principle of human being's virtue are unchanged although the technology and new trends has changed their life sharply.
Description: The fragment unchanged although the is not usually preceded by are
Suggestion: Possible agreement error: Replace are with is

Sentence: As far as I am concerned, the virtue we should admire consists of dignity, beauty, as well as kind.
Description: A verb, base: uninflected present, imperative or infinitive is not usually followed by a verb, present tense, 3rd person singular
Suggestion: Refer to admire and consists

Sentence: On the contrary, the old would like to view the core of the happening things no matter what attracting the outlook is, since they have experienced a lot.
Description: A WH-determiner is not usually followed by a verb, present participle or gerund
Suggestion: Refer to what and attracting

Sentence: However, as the time flies, the little kids are not as persuasible as 50 years ago, since they argue that the grandparents' suggestion has no use at all under the circumstance of the fast changing world.
Error: persuasible Suggestion: No alternate word

Sentence: However, personally, I insist there is no doubt that the grandparents' advise are still valuanble currently.
Error: valuanble Suggestion: valuable

Sentence: Beauty means we should persue what be believe in and what we consider as predominent.
Error: predominent Suggestion: No alternate word
Error: persue Suggestion: pursue

Sentence: Then, kind means we should not only be good to ourslef but also be good to others, and give a hand when the others is in need.
Error: ourslef Suggestion: ourself

Sentence: On the contrary to those virtue, nowadays, owing to the development of the internet, there are increasing numember of children emerge themselves in the virtual world, hence ignore the main principle of the real world.
Error: numember Suggestion: number

Sentence: Some day, he pointed at his grandmather and said she was a SB, which is a virtual word means stupid guy in China.
Error: grandmather Suggestion: grandfather

Sentence: His grandmather was really unpleasent after understanding the meaning and took a long period of time to help his grandson to get rid of those worlds.
Error: grandmather Suggestion: grandfather
Error: unpleasent Suggestion: unpleasant

Sentence: For the little child, they prefer judging the stuffs by the appearence or their feeling.
Error: appearence Suggestion: appearance

Sentence: Due to this, the grandparents are capable to give their grandchildrent a distinguished perspective, which benefit them a lot, especially when they confront difficultys or when they are making choice.
Error: grandchildrent Suggestion: No alternate word

flaws:
No. of Grammatical Errors: 4 2
No. of Spelling Errors: 10 2
Number of Paragraphs: 3 5

better to have 5 paragraphs:

para 1: introduction.
para 2: reason 1
para 3: reason 2
para 4: reason 3 (optional)
para 5: conclusion

Attribute Value Ideal
Score: 21 in 30
Category: Good Excellent
No. of Grammatical Errors: 4 2
No. of Spelling Errors: 10 2
No. of Sentences: 19 15
No. of Words: 440 350
No. of Characters: 2044 1500
No. of Different Words: 243 200
Fourth Root of Number of Words: 4.58 4.7
Average Word Length: 4.645 4.6
Word Length SD: 2.602 2.4
No. of Words greater than 5 chars: 136 100
No. of Words greater than 6 chars: 91 80
No. of Words greater than 7 chars: 61 40
No. of Words greater than 8 chars: 43 20
Use of Passive Voice (%): 0 0
Avg. Sentence Length: 23.158 21.0
Sentence Length SD: 8.139 7.5
Use of Discourse Markers (%): 0.579 0.12
Sentence-Text Coherence: 0.269 0.35
Sentence-Para Coherence: 0.418 0.50
Sentence-Sentence Coherence: 0.138 0.07
Number of Paragraphs: 3 5