Parent[0].Children[0].Name = Johnson
Parent[0].Children[0].Age = 16

Parent[0].Children[1].Name = Jessica
Parent[0].Children[1].Age = 17

Parent[1].Children[0].Name = Lawson
Parent[1].Children[0].Age = 17

Parent[1].Children[1].Name = Jessica
Parent[1].Children[1].Age = 19

realm.where(Parent.class).beginGroup().equalTo("childrens.name","Jessica").equalTo("childrens.age","17").endGroup().findAll();