The “Hybrid Patrimony” in Families of the Elderly: Evidentiary and Succession Challenges Post-STF Theme 1,236

Abstract

The recent ruling on Theme 1,236 by the Supreme Federal Court (STF) eliminated the mandatory property separation regime for individuals over 70, granting them the right to choose their marital property regime via public deed. However, the prospective effect (ex nunc) of the decision creates a complex “hybrid estate” in preexisting unions. This article analyzes the legal consequences and patrimonial implications of this modulation for couples changing regimes. Adopting an applied, qualitative, and exploratory-descriptive approach, the study employs the deductive method grounded in bibliographic review and critical-propositional documentary-jurisprudential analysis. Findings show that this temporal division triggers STF Precedent No. 377 for the prior period, which, under Superior Court of Justice (STJ) case law, requires material proof of joint effort. This scenario creates evidentiary uncertainty, converting newly acquired autonomy into potential inheritance litigation. The study concludes that removing statutory restrictions is insufficient to protect older adults, rendering estate planning essential during regime modification. Attorneys and notaries must guide the settlement of preexisting assets through express declarations on communicability in the public deed, securing genuine autonomy and family stability.