A wizard dies – but his familiar escapes unharmed. He &/or she (the wizard) is Reincarnated, via the spell. He &/or she gains a new race with new abilities. Basic skills, proficiencies, physical (Str / Dex / Con) and psychological abilities (Int / Wis / Cha) all change as RAW dictates (‘its complicated’).
He &/or she had a familiar previous to death. The familiar survived, as noted, as he &/or she &/or it (possibly spayed?) was off on an errand and did not die.
What happens upon wizard seeking his &/or her familiar?
Does the wizard need to re-cast Find Familiar? If he &/or she does (&/or does not), does this wizard gain the same old shape (fae, celestial, fiend) & style (possibly spayed?) familiar as previous – or is it a brand-spanking-new fresh off the press familiar out of the Outer Planes?
Repeat of Question: Wizard has familiar. Wizard dies YET familiar is okay. Wizard gains a new body. Wizard must re-cast Find Familiar: yes / no? Wizard gets a NEW familiar, yes / no?