Tier 1 Sponsoring Parents with vaf1b

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Hi Everyone,
Currently I am on Tier1 General Category. I would like sponsor my dad to visit me for a month. As it mentioned in the VISA4UK website For sponsoring relatives should use vaf1b application form. However beginning of the form it clearly mentioned that

You should only complete this form if your main reason for visiting the UK is to see one of the family members listed below and
they are permanently settled in the UK.
• Spouse, civil partner, father, mother, son, daughter, brother or sister;
• Grandfather, grandmother, grandson or granddaughter;
• Spouse’s or civil partner’s father, mother, brother or sister;
• Son or daughter’s spouse or civil partner;
• Stepfather, stepmother, stepson, stepdaughter, stepbrother or stepsister; or
• Unmarried partner with whom you have lived as a couple for at least two of the last three years.

If you are visiting any relatives not listed above OR if they are not permanently settled in the UK you must not complete this form.

I am not permanently settled in the UK, which application form my dad should use then?

has anyone in tier1 sponsored/applied their relative with vaf1b form?

Thank you