However, any title search would disclose the existence of the land contract and smart lenders would require the consent of the contract purchaser in connection with the proposed transaction. 

It also then requires that the existing lender give written consent.

If a sibling had now deceased parent sign over property to them, without the consent of other family, is there any legal recourse?

Notice to the lender has caveats as to notice and asking them to deny consent or consent is assumed, but this is only a ploy to justify the position of a buyer, it may or may not work.As Brian mentioned, the due on sale can be an issue with either one.Lenders will generally treat an installment sale the same as they do with a lease, 75% of income to off set the debt.

Here is the clause.... perhaps you can amend your lease and/or use it in the future.AIR CONDITIONERS.Tenant agrees to not install or cause to be installed air conditioners without prior written consent of Landlord.

These lenders have strict protocols in place for releasing this info, not easy to get even if you have the borrower's written consent.

Bottom line, you need an existing relationship and prior consent to text someone if you are a business.

That way I never run the risk of an appraiser going in without my consent (especially if the buyer's agent gives out the code...I've had that happen before).

Here are some issues that should be addressed:Title search,Notice and consent of underlying mortgagees (due on sale)Terms sufficient to address credit problems if any of the borrower; andInsurance, loss payee claims and set offs to underlying mortgagee(s)Death, Incapacitation,Liens from assessments and labor and materials,Liens from Creditors,IRS and judgmentsBankruptcy issues and insolvencyNotice of default and demands to cureAssignments of interestsMajor improvements and consentCare of the propertyEscrows of deeds for the CFDTax notices and paymentsInsurance and tax escrows with assignmentsTax reporting and loan servicingThese are off the top of my head at the moment, so you get the idea....Good luck, Bill

Plus selling would require both of your consent.