C'est is for a singular , Ce sont for a plural .
because of the clash of the two vowels.
C'est mon fils , c'est ma fille = He is / this is my son, she is/ this is my daughter
Ce sont mes enfants = These are my children / They are my children
Hope this helps!
Ce sont mes livres -- This are my books. Here the demonstrative pronoun ce is not like an adjective to "books". It is a demonstrative pronoun all by itself and hence is not matched in gender and number to "books".
Ces livres sont à moi. -- These books belong to me. In this case ces refers directly to the books and behaves like an adjective. Therefore it needs to be matched to "books".
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