This is not grammatically correct. It could be recast as, "Your child needs help with nothing in particular" or, better, "Your child does not need help with anything."
Yes, 'for free', is grammatically correct.
The phrase 'at the discretion of' is grammatically correct. It means that a particular person has the authority to make a decision.
Yes, the phrase "I came home at about one o'clock" is grammatically correct. It follows a subject-verb-object structure and conveys a clear message about the time of arrival.
Yes
The phrase "had already left" is grammatically correct. The phrase "had already been gone" is not grammatically correct.
yes, it is
Could you please provide more context or details about what "they" are doing in order for me to determine if it is grammatically correct?
Yes. It is a noun phrase.
Yes, it is grammatically correct. "Part and parcel" is a phrase that originated as a legal term in the fifteenth century. It means an essential or integral part.
No, it's not grammatically correct. Try this: She wished she had ran instead of marrying him.
The phrase "c'est Grace" is grammatically correct if Grace is a person. If 'grace (Ã ) ' is used int the sense of thanks (to), then it lacks a complement.
"have well and" can be a grammatically correct phrase only if the word "and" is followed by another adverb, with "well and truly" probably being the most common. In fact this phrase is so common that it is best avoided as a cliche.