If 2 or more parties come into a contract and sign an MOU, and and while the MOU is under execution phase one member of the MOU passes away due to which there is some delay in the meeting of the MOU however over a period of time 90% of the payment of the MOU is made with some breach in the date of payments , what is the validity of the MOU? Can any party challenge the MOU as being null and void because of delays of paymnts or can the other party just demand reasonable interst on the delays and non payments.