I might recommend that you not put them into any short term loans because you have no guarantee on the end results of the sale. I would suggest that you put them into a Hyrbid Option or a 1 Yr Option with No prepay, just in case their home is on market longer than planned. However, if you are the one doing the loan on their new purchase, I wouldnt refi this home unless you are paying off debts to improve their financial status otherwise the cost of the refi may not be beneficial to them. They will have cost associated with their sale and could use that equity to pay buyers closing cost. Then get two referrals upfront for the great service.
Be Blessed