Conjunctions are the words that help in combining the likely related things together.
The sentence that is correctly combined is:
Both my daughter and my son need help with homework.
Conjunction is the part of speech that helps in joining words, phrases and sentences together. In the given sentence, 'both' and 'and' have been used to combine the given sentences to form one sentence. The action done in both the sentences are same. Therefore, 'both' has been used to denote the same action. The use of 'and' has been used to join daughter and son because they are of the same group.
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