Assuming there is no prenuptial agreement providing for separation of assets, the apartment purchased by your uncle’s second wife is an asset of the matrimonial community, meaning that it belongs 50-50 to the spouses.
Your uncle’s wife will not be able to sell the apartment by herself, even if it’s in her sole name, because the sale of a matrimonial asset requires the signatures of both spouses. The Registrar of Title will refuse to transfer property with just one signature whenever the owner shows up as married on the title.
If your cousin is your uncle’s only child, and there is no will, your cousin will inherit 100% of his father’s assets, including 50% of the apartment.
Article 740 of the Civil Code has nothing to do with the case at hand unless your cousin is also dying and has children himself. In that hypothesis, your cousin’s children will inherit their grandfather’s assets.
|