"I need a night off from the children."
Translation:Ho bisogno di una notte via dai ragazzi.
gli is used with words beginning with 'z' or 's+consonant' plurals. all other masculine nouns take 'i' (dei) here is a page on articles. http://www.uvm.edu/~cmazzoni/3grammatica/grammatica/prepositions.html 'da' is the correct preposition.