To be successful in an I-601 waiver, you will need to prove that if you are not allowed to adjust status, your U.S. Citizen and Lawful Permanent Resident family members will suffer extreme hardship. So the things you list will definitely help. You should also definitely get an experienced immigration attorney to help you with this. If you decide not to go with the attorney that you already spoke to, you can look at www.ailalawyer.com to help you find one. Do not be afraid to ask how much experience they have in doing those types of waivers. In the meantime, you should start collecting evidence of how all those family members depend on you for support, financial and emotional. Some of that evidence can be statements describing you, your good moral character and how you are important in their lives.
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