Our sellers won't move by contract date. What are our options?
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You do not post enough information. Has the closing occurred? If so, then ownership of the property passed to you. In that case, the sellers are basically your tenants and if they will not leave the property then you would have to evict them or they can pay you rent - depending on how badly you need them to get out and why they have not left. If the closing has not occurred, then the sellers still own the property and you can terminate the purchase agreement and possibly get any earnest money refunded.
Before you do anything, you need to speak with your real estate attorney regarding the situation. If you do not have an attorney (not sure how you could buy property without one) then you need to get one.