The maximum duration of the Visit Visa is 6 months. Initially it is issued for 1 month and extend to another 5 months.
You can get a visit visa for your blood relatives. To apply for the Visit visa the requirements are
- holding a Valid Residence permit.
- Minimum salary of 5000 ( I am not sure of this amount)
- A letter from your company.
- ( A bit of luck)

Note that there is also an age limit for people coming on Visit Visa. I guess it is 60 years.

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