Sorry to know about your father. You mentioned ct guided fnac showed metastasis. From the information you have provided it looks like it is a case of lung cancer with brain and bone metastases. I would suggest you consult a oncologist for further guidance.
It may not be possible to regenerate brain cells but the movement disabilities and sleep can be improved with help of homoeopathic treatment and physiotherapy.
You can consult me at Lybrate for homoeopathic treatment.
it is unfortunate that your brother had to undergo repeated surgeries, but from the information you have given it appears that he has been treated properly as per the standard guidelines for these kind of tumors. Now I guess it is grade 4 not 4th stage of the tumor and grading not staging is used for these kind of brain tumor. Treatment now is difficult and depends on the neurological and general condition of the patient, findings on mri scan like location and extent of the tumor and expectations of the patient and relatives from the treatment etc. You have to understand that these tumors are difficult to cure completely and all we can do is to give best available treatment and care.