1099 NEC or 1099 MISC

Hello , 

If taxpayer worked for his brother's business , he was assissting online transactions , performing and reviewing online payments , dealing with satate agencies , following up with different accounts , etc... in gemeral administrative and accounting role but not part time or even in daily basis or weekly basis , like on demand 

The questions : 

1. Brothers' business will pay like 8000 before end of the year against these services performed during the year

2. What type of 1099 comply with this payment ?

3. Can the owner of this business in general issue 1099 for his brother ? 

Please advise and if there is anything else to be considered .

Thank you