Do you it is good to lose weight after going to hospital. It is really very bad. If you want to lose weight, start with proper way in which you should follow diet plan, do some exercise this will definitely works.
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It is possible to loss muscle mass and to rebuild it.
Your brother will be given exercises at the rehab centre where he is.
It takes as long as it takes. Regenerating muscle seems relatively easy but when you factor in other physical and mental trauma. Some people are in rehab for months, if not years. Your brother's recovery and journey will be unique to him.
If you have questions, could you not address them to your brother's doctor? In my experience, doctor's are often willing to inform relatives.
I'm not a doctor but it sounds as though your brother has some promising signs. He has feeling and some movement. Maybe swelling has affected movement??
I think that your brother has been unwell and may need considerable time to heal. I think that your brother should be able to walk again but you will need to ask his doctor and even then may just need to take it on a day by day basis.
If you are scared now I expect when your brother is feeling a little better that he too will feel scared and overwhelmed. A positive outlook can significantly improve a persons recovery.
Good luck. I wish your brother a speedy recovery and hope that he will one day soon be walking again.
Worst case: your brother can't walk but he is still alive. Life is everything!