Please help--So many questions

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Hello,

My nephew traveled abroad and secretly got a leg lengthening operation without telling his parents. He is 20 years old. Even though he is an adult his parents are so worried about him because he doesn't share any information about the surgery or how it's going. He got the surgery in late February of this year. He got the precision. He looks okay but still walks very stiffly. He is not really doing the body therapy that would be expected so my sister is pretty concerned he won't heal correctly. What could go wrong if a patient doesn't do the proper therapy? How often should physical exercises be performed after the surgery? I would assume every day but I would like to know what experts out there say about it. Now that he's home--not abroad where the surgery center is--isn't he supposed to see an orthopedic surgeon at home to check on his condition? He is communicating with the surgeon who worked on him by messaging but to me that doesn't seem like enough doctor care. What do you think?
Question #1 What could go wrong if a patient doesn't do the proper therapy?
Question #2 How often should physical exercises be performed after the surgery?
Question #3 Is he supposed to see an orthopedic surgeon at home to check on his condition?
Thank you so much for your input. Bless you.

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Thank you for your well thought out response. I should clarify--we are not talking to anyone about his case. I'm asking questions here in a completely private way and I would never talk to anyone about him or his case. Nobody here knows him so I can safely ask anonymous questions. The information we garner here will help my nephew get better support from all of us & we definitely want to support him. We are on his side & want to help him get the most out of his journey and recover fully.

If anyone has some other specific answers to my previous questions, I would welcome and appreciate all input. Thank you very much.