It requires a solid FICO, that you get pre-approved with all current financials held in file beforehand, with the complete contract package submitted upon execution which starts the clock; insurance must be arranged within three days for lender underwriting. 

The eviction process can be lengthy, costly, and may result in getting the property back in poor condition.To avoid this, you might consider offering a "cash for keys" arrangement.

I think this arrangement is better than nothing or me taking her to court to only get the land back. 

I'd prefer 30 year fixed rate debt at 7% over this arrangement unless there is something that I am missing.

Another step is to ask your current lender if an expedited post-disaster inspection can be arranged to speed things up.

Try to arrange for an “open house” day for buyers to walk through with contractors and eliminate inspection problems/delays. 

Alternatively, your sibling might use a 1031 exchange to defer taxes by reinvesting in like-kind properties, though this doesn't directly fund a primary residence.Other ideas include leveraging a HELOC on the rental properties for the down payment, taking out a 401(k) loan, structuring an owner-financed agreement, or a lease-to-own arrangement.

If an in-person visit is not feasible, we can easily arrange video tours to accommodate your schedule.

I recommend reaching out to the builders directly to negotiate any potential arrangements.

I was going on vacation, so I arranged for my partner to give him half the second payment for supplies only.