The person who purchased the tax lien from the township must pay the taxes for an additional two years before they can start the foreclosure process. That process will likely take another 6-9 months to complete once started. However, interest and fess will continue to accrue. Best of luck.
This answer is for information purposes only. No attorney/client relationship has been established nor intended to be established. The answer provided is solely based on the question as presented and additional information if known may result in an entirely different response.
Picking up on the other attorney's answer, if the tax purchaser files a tax foreclosure case (after paying the taxes for 2 years) then you can redeem (or pay off) the tax lien up to the point that a judgment is entered. The entry of a judgment in a tax foreclosure case cuts off the right of redemption and transfers the property to the plaintiff.
Unlike regular mortgage foreclosures, there is usually no sheriff's sale in a tax foreclosure case unless there are federal liens that need to be foreclosed. The plaintiff must provide the homeowner with notice of its intent to apply for entry of a final judgment. Bankruptcy is always an option to stave off a tax foreclosure.