English to Spanish Law/Patents Law: Contract(s)

How would you translate "estates" here? Does it refer to "heirs"? I am asking this because the definitions of estate that I've found so far talk about property, but the way this text has been written, it appears that it refers to people, not things. Ideas?

The Employee fully releases and discharges forever XXXXX, and its current and former parent companies, subsidiaries, affiliates, successors, predecessors, agents, directors and officers, stockholders and estates, employees, trustees, representatives, owners, attorneys, related corporations, assigns, and affiliated organizations (hereafter referred to collectively as the “Released Parties”), and each and all of them, from any and all liabilities, claims, causes of action, charges, complaints, obligations, costs, losses, damages, injuries, attorneys’ fees, and other legal responsibilities, of any form whatsoever, whether known or unknown, unforeseen, unanticipated, unsuspected or latent, which Employee or Employee’s heirs, administrators, executors, successors in interest, and/or assigns (collectively, “Releasing Parties”) have incurred or expect to incur,...

Thank you!