Yes
The son and his sister = 1 son, 1 sister
The sons and their sister = many sons, 1 sister
The son and his sisters = 1 son, many sisters
The sons and their sisters = many sons, many sisters
Though in reality this is a strange way to say it. More normal would be "The sons and daughters".
If the sentence is referring to sons and sisters of the sons,then yes, it is quite correct to say "sons and their sisters".
This sentence is grammatically correct.
It is grammatically correct to say , "I am in school today." This is because you are in the building, not at the building.
Grammatically correct, maybe, but idiomatically wrong. We normally say "buy it for me."
no it is not correct to say enjoy your vacations
Ruins is plural so the grammatically correct form is The Ruins of Windsor are
It is grammatically incorrect to say sister and sister. You just say sisters.
It is grammatically correct to say: There is nothing wrong with this machine.It is not grammatically correct to say: Will it is be grammatically correct to say ....The correct way to write that or say that would be: Would it be grammatically correct to say....
'What a drunkard you are' is a grammatically correct English sentence.
"Media is here to stay" is the correct phrasing because "media" is a collective noun referring to a singular concept, so it should be paired with a singular verb "is."
No, it is not grammatically correct to say "what a fun." It should be corrected to "What fun!" to make it grammatically accurate.
No. Him and me is correct.
This sentence is grammatically correct.
It is not, but it is widely used because it conveys the general idea of the question as well as its grammatically correct version.No you should say "Where are you" the at at the end is not needed.
No, it is not grammatically correct to say "keep stick to." The correct phrase would be "keep sticking to" or "stick to."
It is grammatically correct to say , "I am in school today." This is because you are in the building, not at the building.
no
yes