Jesus knows what he has planned for you. I was pretty set on a man with no kids at home, but the Lord has changed my heart to whatever be your will, Lord. I know studies show combined marriages with children from two sets of parents rarely make it, because of too much stress, but Jesus knows what you can handle and if he is in it, it will work. It doesn't hurt to date them and see if your heart changes as you get to know his kids and they get to know you, but ultuimately it's up to you. Jesus will give you the desires of your heart if you are seeking his Kingdom first.