In order for the timeshare to be the property of some other person and beyond the reach of the bankruptcy trustee, title woud have to have been recorded with the appropriate government agency at least 90 days before you filed your bankrupty petition. Bankr. Code § 547.
Otherwise, the bankruptcy trustee could potentially avoid the transfer. Though, as a practical matter, since timeshares are effectively unmarketable, the trustee probably won't care one way or the other, because there's no money in the timeshare that could benefit your unsecured creditors.
Hope this helps.
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