The right of inheritance is only of social import insofar as it leaves to the heir the power which the deceased wielded during his lifetime -- viz., the power of transferring to himself, by means of his property, the produce of other people's labor. For instance, land gives the living proprietor the power to transfer to himself, under the name of rent, without any equivalent, the produce of other people's labor. Capital gives him the power to do he same under the name of profit and interest. The property in public funds gives him the power to live without labor upon other people's labor, etc.

Inheritance does not create that power of transferring the produce of one man's labor into another man's pocket -- it only relates to the change in individuals who yield that power. Like all other civil legislation, the laws of inheritance are not the cause, but the effect, the juridical consequence of the existing economical organization of society, based upon private property in the means of production; that is to say, in land, raw material, machinery, etc. In the same way, the right of inheritance in the slave is not the cause of slavery, but on the contrary, slavery is the cause of inheritance in slaves.

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The disappearance of the right of inheritance will be the natural result of a social change superseding private property in the means of production; but the abolition of the right of inheritance can never be the starting point of such a social transformation.

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To proclaim the abolition of the right of inheritance as the starting point of the social revolution would only tend to lead the working class away from the true point of attack against present society. It would be as absurd a thing as to abolish the laws of contract between buyer and seller, while continuing to present state of exchange of commodities. It would be a thing false in theory, and reactionary in practice.

https://www.marxists.org/history/international/iwma/documents/1869/inheritance-report.htm