One of the problems in the third world is that thugs backed by local politicians can illegally take over your land. Neighbors can start stealing your land meter by meter every year. Even if your relative becomes a guardian of this land, don't expect anything good from such relatives. For instance, people get fake death certificates of the real owner in order to take over others' lands.

8000 tree coffee plantation could be 4 to 18 acres of land. Unless you visit Madagascar every 6 months, unless you have a trusty hand, better sell it. I don't know the prices in Madagascar, you can get at least $200K for it.