Familiar Bond question, about sharing spells

Games Discussion Ars Magica
1

Would any guidelines support (ReVi most likely) the magus casting a spell through the familiar bond (or an Intangible Tunnel) to allow the familiar to use the effect?
I was thinking of a InCo spell to track a target which the familiar has a scent of...

Or some MuVi spell to allow a spell to be shared like that?

2

There is the Standard book guideline - create a conduit. That seems to be what you are looking for. your gm may or may not add an extra magnitude to allow the familiar to "control" the spell. I wouldn't add that magnitude though.