Parents

My dear mother & father
For all of the things that
you've sacrifice...
I am really, thankful and grateful

^ In the third line "sacrifice" should be sacrificed and the & should be replaced by the word and especially since you don't use it again anywhere else in the piece. I do, however, like where you began the piece, direct, and strong. "Dear Mother and Father" gives the audience a clue as to the direction of the piece as well as a heads up that this is probably going to be raw emotion and pure honesty (whether it's the author's or a character's does not really matter here - so great job of leaving it ambiguous).

I apologize for being
not responsible in your eyes,
failing some of my subjects,
seldom obey your commands,
and for the things
that I have done,
I am genuinely sorry.

^ Now we see that the piece is going to be purely free verse, which gives you a lot of room to work with. You start this stanza with pure honesty, and it really is a child's perspective because of the examples given - nicely but over used. Something about the wording of the fourth line is off a bit though, I'm just not quite sure what's wrong or missing.

And sometimes as a child,
We may have a grudge on you
but, we are still a person too
whom have a reason
because we are suffering from pain,
pain that you've cost us.

^ For the beginning you were using "I" and first person, now you are using "we" third person and the jump is a bit confusing and entirely unnecessary. But if you are going to keep it then the third line should read "we are still people too" instead. Also whom in the next line should just be who because of the multiples. The line before the last needs stronger punctuation than it has, especially since you are using the same word twice in a row, maybe a dash or semi-colon? or even better, a period and capital letter at the start of the final line.

And there are still
questions unanswered in our mind
as your daughter/son
Sometimes that's the reason why
why we are quiet or just by
by observing
or perhaps, let it all out (cry)
when we don't take it
ANYMORE.
and the main question is
"WHY?"

^Again there is a disconnect in the transition from one stanza to another. Also the capitalized words are unnecessary because when poetry is done well the words have emphasis without print clues such as italicizing or capitalizing - and this piece has potential to be one of those that does not need clues.

Sometimes, putting our grudges down
You could do something about that
We love hugs, hugs that
we can feel that we are
loved, protected, and cared
and the sense of belongingness
in your two arms.
We love that, as your child.

^ While I understand that poets have the ability to morph words and give birth to new ones as well, belongingness is completely unnecessary because the phrase is actually, commonly "and a sense of belonging" therefore in your case "belonging" as is would be perfectly acceptable. Otherwise this is a well done conclusion - even though there is a disconnect somewhere in the piece and it is something that does not tie back to the beginning. In fact, this piece as a whole left me greatly confused, which is a shame, because I think I know where you wanted it to go and I'm saddened because it never got there.

3/5 but better luck next time.