Police will allege the two girls had the procedure, which is also known as female circumcision, performed on them in NSW when they were aged six and seven within the past 18 months.
Three other people have been charged over the alleged genital mutilation.
Also arrested today was a 68-year-old woman who has been charged with two counts of prohibition of female genital mutilation.
Police will allege the woman performed the procedure on the girls.
She has been granted conditional bail and will face Campbelltown Local Court on October 3.
A 42-year-old man and a 35-year-old woman were arrested last Friday and charged with two counts each of female genital mutilation.
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