Group membership is a basic building block for group communication systems. It has been shown that the specifications of group membership in partitionable systems have not yet reached the level of maturity of primary-partition specifications. In operational MANETs, the problem becomes even more complex since they are very dynamic networks and can experience a wide amount of churn. Another problem close to group membership is consensus which can be used to solve group membership in primary-partition systems. We propose to discuss about the interest of designing a solution to group membership in partitionable systems built over MANETs by adapting Paxos.