[Gale/Vivi]
It is a difficult trap to avoid, one even I did not successfully manage. Unfortunately, so long as you bear their name, to them you are a possession - one to be traded to the highest bidder.
You can, of course, outright refuse. I would suggest wooing Altair to your side, but I feel that there are more family politics in play than is known. His objection, I fear, will carry little weight.
I would offer you an ear to listen, as that is as much as I can do without offering my nephew in exchange for Altair, but that simply shifts your problem rather than solving it. And I fear my becoming your champion would only serve to further harm you.