Mention of 2 Allotees in contract

Hello I have bought an under construction apartment and the contract draft mentions like below. Hereinafter referred to as the “DEVELOPERs/DEVELOPER” (Which expression unless repugnant to the context or meaning thereof shall mean and include its partners for the time being constituting the firm their respective heirs, executors, administrators and assigns) PARTY OF FIRST PART.... AND 1. MR. X Hereinafter referred to as “PURCHASERS / Allottee"” (which expression unless repugnant to the context or meaning thereof shall mean and include his/her/their heirs, executors, administrators and assigns) PARTY OF SECOND PART …. MR. Y Hereinafter referred to as “CONSENTING PARTY/ Allottee"” (which expression unless repugnant to the context or meaning thereof shall mean and include his/her/their heirs, executors, administrators and assigns) PARTY OF THIRD PART …. My question is why there are 2 allottee needed?