Hello Mayank ,
Welcome to the healthcare magic forum ,
Long lasting fever should be investigated properly.Is there any evening rise of temperature ?
Is it accompanied by chills and rigors
Is there is any problem in urine like burning micturition , pain etc.
Is there any history of cough ?
I think he should go for the investigations like haemogram , ESR , CBC , widal test
, MP test , Montoux test ,X ray chest , complete urine examination , ultrasound
etc.Consult a good physician who is MD.
Wishing your brother good health and long life ,