If a wizard/sorcerer employs the spell "Imbue Familiar with Spell Ability", transfers spells on his familiar and has then his familiar cast a spell (e.g. Invisibility) on him, can his familiar share that spell (become invisible as well)?
In other words: does the Share Spell ability of the familiar still work although it is not the master that is casting the spell?
At the master’s option, he may have any spell ... he casts on himself also affect his familiar.
I tend to say ´no´, but I´m not quite sure. One could argue that although the familiar functions as the caster it´s still the master´s spell that´s being cast and the master´s caster level that is being applied.
... The transferred spell's variable characteristics (range, duration, area, and so on) function according to your level. ... (Spell description "Imbue Familiar with Spell Ability")
So, in a way, the master casts the spell (Invisibility in this case) - via his familiar - on himself. If you see it like this the familiar should then be able to share that spell.