You can test your property to anyone.
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The world is more interesting than you think.
Minor or disabled children of the testator, his disabled spouse and parents, as well as disabled dependents of the testator inherit, regardless of the content of the will, at least half of the share that would be due to each of them when inheriting according to the law (obligatory share). Thus, the elderly father, even if at every meeting he scolded his son with a bowl with the cry of "Pidaras, the shame of our family" - will receive no less than half, even if his son gave all the property to his fellow resident.
Not to mention the fact that there is a certain difference - the joint property remaining after the death of one spouse the property of the other - or the separate property that they test each other and after the death of the one on whom the common apartment is registered, the latter walks on the bushes, without even having a teaspoon and a pot, and tries with the spouse's mother-in-law, who did not wish to know him.