Where a minor for whom a general guardian of the property has not been appointed shall acquire real property, the guardianship of his property with the rights, powers and duties of a guardian in socage belongs:
The rights and authority of every such guardian shall be superseded by a testamentary or other guardian appointed in pursuance of this article or in pursuance of article ten of the surrogates court act.
N.Y. Dom. Rel.Law § 80