You can never be equitable in dealing with more than one wife, no matter how hard you try. If you correct this situation and maintain righteousness, GOD is Forgiver, Most Merciful. If you deem it best for the orphans, you may marry their mothers - you may marry two, three, or four. If you fear lest you become unfair, then you shall be content with only one, or with what you already have. Additionally, you are thus more likely to avoid financial hardship.
Additional information is available on the site.
Please follow these two links for the information. At the end, sister, I invite you to examine something most important. That is the definition of the word Muslim itself. A true Muslim devotes his worship to God alone independent of messengers and saints. To worship God alone means to call upon Him alone in the prayer and not add any other names anywhere, nor refer to any other books except Quran for religious information.