I do not know why you are not responding, but you are not charged per question, per response, nor per answer. So after I give you my answer, you can continue to ask me questions without additional charge until you are satisfied. I apologize if it is a site issue that you posted and the post did not go through.
For your son that is an IT professional, he may be able to get an H-1B professional visa.
The information on the H-1B is basically that he must have a job offer, the job offer must be for a company that is offering a position that is related to his degree and experience. The position must also normally require a bachelor's degree or higher. The company must have a need for someone in that position and must have the resources to be able to pay him what is normally paid to someone in that position. All these things must be provable with financials, business plan, etc. Also, because they are used up for this year, he will need to apply on April 1, 2016 to start working on October 1, 2016 or later. The exception is if he applies for a cap-exempt job and those are at an institution of higher education or its affiliated or related nonprofit entities or a nonprofit research organization, or a government research organization. Those are not subject to this numerical cap.
Here is an official link to the H-1B:
Here is a link to the cap:
For your other son, he could apply for a B-2 tourist visa to come temporarily, but he cannot work. Here is a link:
Or he could apply for a Humanitarian Parole that also would allow him to visit temporarily, but not work. Here is the link:
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