Extending tourist visa

Hello all,

To briefly explain my situation; my family and I arrived in Tabatinga,Brazil at the beginning of November, traveled to Manaus the middle of November and had our third child the 10th of December at Unimed Maternidade and are now working on our permanent residence visa based on Brazilian Child/Family reunion. We have an apartment in Tabatinga as that's where we plan on living.
I have attained and paid our GRU for all the family members and scheduled our appointments with the PF.

My issue that I have is concerning the appointments with the PF. They're currently scheduled for February 12(that was the earliest date that the website would give me) but we have some conflicts.
  First, our flight back back to Tabatinga is on January 26th. Would it be possible to reschedule the appointment in Tabatinga? Or would we need to change our ticket?
  Second, our tourist visas will run out the beginning of February before our appointments. Can we extend our visas? If so, how do we extend them? My wife and I have the former tourist visas(good for 10 years) whereas our two older kids have the new E visas.

As another thought, would it be possible to move our appointment to a closer date? There's no option on the website but I didn't know if it could change if you talked to someone personally at the PF.

Also, I lost the agendamento number for my daughter. I have the the request number but was unable to save her agendamento number when I scheduled it, now I have no clue how to retrieve it. Anyone know how to do that?

Thank you in advance

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