The territory of the seigneury is the subject of claims by the Mohawk Council of Kanesatake, this claim having led to the Oka crisis in 1990. In 2008, the Federal Ministry of Crown-Indigenous Relations and Northern Development Canada agreed that the file relating to the seigneury of Lac-des-Deux-Montagnes or a specific claim. However, the band council indicates that it was agreed that this file should be considered third-rate, that is to say, not the subject of a comprehensive claim or a specific claim. The Mohawks dispute the ministry's claim that the Sulpicians are the "full owners and in perpetuity" of the entire seigneury "and the rights of the natives are limited to the lands they occupy, excluding the hunting grounds. They argue that the Treaty of Paris, the Treaty of Oswesgatchie and the Royal Proclamation recognize their rights over the entire seigneury and that their rights were not protected by Canada, the Mohawaks never having been informed of the land transactions relating to the seigneury.
