a Mother Da mother -in -law of woman of your brother is your grandmother , given that it is the mother of mother -in -law of your sister -in -law . Therefore, given that the mother -in -law of his sister -in -law is his mother , the question makes reference to his brother's grandmother. Thus, it is correct to state that it also your grandmother .
a Personing word comes from the Latin " Socra ", which has as meaning and definition to Mother of wife or husband . That way, when we look at Question , we see that the mother -in -law is that it is referring to is the mother do your brother . Therefore, it is concluded that the mother of the mother of your brother is your grandmother .