I864A Sponsor - H1b or Greencard

[lifesgud1]

Hello All,

My parents family based GC petition/was filed by my grandmother who is US Citizen.

Now their date is current and we received instruction to fill out I-864A and related process.

My grandmother passed away , so i wanted to know can someone else be financial sponsor ?

I am here in US on H1b status , so can i be the financial sponsor and if yes what additional forms i have to provide ?