"My beautiful cousins" is indeed a perfectly grammatical phrase. It is, of course, not a complete sentence.
I am pleased to glimpse at your beautiful face Not sure what you mean by the inside out part
No, "will be had" is not a correct grammar. The correct grammar would be "will have."
The correct grammar is: "Are those correct?"
The correct grammar for this sentence is: "When did you send it?"
No, the correct grammar would be "I hate you the way you hate me."
I am pleased to glimpse at your beautiful face Not sure what you mean by the inside out part
No this is incorrect grammar. To make the sentence grammatically correct you should say: One of my cousins came yesterday.
I surprisingly received these beautiful flowers on my birthday.
No, "will be had" is not a correct grammar. The correct grammar would be "will have."
No, it is correct grammar, not a correct grammar.
The correct grammar is: "Are those correct?"
"On a train" is correct grammar.
The correct grammar for this sentence is: "When did you send it?"
No, the correct grammar would be "I hate you the way you hate me."
no_____If the sentence is You do do that (meaning You are in the habit of doing that) the grammar is perfectly correct and the sentence 'does have correct grammar'.
"July has just been started" is not correct grammar, instead the correct grammar is "July has just started."
The correct way to phrase this question is: "Is my mother and I correct grammar?"