I heard that it is difficult to get visit visas for young ladies alone. does they have UAE RP under your sponsorship? and if you have good profession on your Visa you may be able to bring them on arrival visa along with you. another option is take your visa also from some hotel or from Qatar airways and bring them along with you, any of these means wont get you visa for more than 1 month or max 2 months you may ve to do a lot of exit entry travels.