A consulting research advisory on how California law governs fractional tenancy-in-common real property when a co-owner dies without a will — with the procedural path, the tax exposure, the partition rights, and the negotiation leverage all mapped in one place.
From the executive-brief summary to the counsel-dossier authority catalog, every document shares the same doctrinal foundation, the same statutory citations, and the same visual language. Read in any order. Share any piece.
Single-screen executive summary. The controlling statutory divergence, the corrected ownership math, and the bottom-line consequence in one read.
Fifteen parts. Every controlling statute, every fact-pattern scenario, every confidence rating, every intake-conditioned caveat. The complete doctrinal and strategic map.
Five phases — Week 1 through Month 18. Every filing, every notice, every deadline, every decision point, with supporting document templates and vocabulary.
Authority catalog, pleading roadmap, twenty-five-question intake, seven-scenario math, adversarial challenge, Chain-of-Verification, negotiation leverage map, and UPL firewall.
Fifteen questions the family will ask, answered in plain language. Written to be read at the kitchen table by people who are grieving and confused.
Six engineered diagrams: ownership cascade, statutory 50/50 split, jurisdictional divergence map, procedural decision tree, Proposition 19 reassessment trigger, and probate fee scale.
Fifteen files of underlying research: Phase 0 decomposition, thirteen-step Beard Doctrine protocol, adversarial red-team, Chain-of-Verification, engineering spec, and knowledge-graph seed.
One cover letter for retained counsel and one family-facing email. Edit the placeholders, send, done.
The matter. Five siblings hold a California single-family residence as tenants in common in unequal shares — 60%, 10%, 10%, 10%, 10% — title originally vested by parental conveyance. The property is characterized as separate property under Cal. Fam. Code §770(a)(2). Two of the five cotenants have died intestate; each was survived by a spouse and no issue. Three cotenants remain. Title has not yet moved, no probate has been opened, and the surviving cotenants have not yet agreed on disposition.
The question. How does California law allocate the fractional interests of the two decedent cotenants between (i) the surviving spouses and (ii) the surviving collateral relatives, and what procedural and tax consequences follow?
Most of the country would answer this one way — the Uniform Probate Code answer, where the surviving spouse takes 100% when no descendants or parents survive. Hawaii answers it that way. Approximately thirty UPC-adopting states answer it that way. California does not.
Under Cal. Prob. Code §6401(c)(2)(B), when an intestate decedent leaves no issue but is survived by parents, siblings, or issue of a predeceased sibling, the surviving spouse takes one-half of the separate-property estate. The other half passes under §6402(c) by §240 representation to those collateral relatives. California retained this carve-out when most UPC-adopting jurisdictions eliminated it in 1990. The rule is current law and controls this matter.
For the subject property, the statute yields the following allocation: each surviving spouse receives a 5% fractional interest (one-half of the decedent’s 10% share), and the three surviving siblings receive the remaining 5% of each decedent’s share distributed by representation. Revised vesting: 60 / 13.33 / 13.33 / 13.33 / 5 / 5. Every downstream figure in this advisory — tax exposure, procedural cost, partition mathematics, negotiation range — builds from that allocation.
The river and the levee. Think of the law as a river. Intestate succession has a current — it carries property from the dead to the living along a path the legislature chose. That path is not a guess; it is written down, numbered, and updated. A levee is a rule of thumb that works in some states and not others. Knowing which levee applies to which river is the whole job.
The surviving siblings can buy out the wives at appraised value. CCP §874.317. Under the 2023 Partition of Real Property Act, the non-partitioning cotenants hold a statutory right of first refusal before any open-market sale. The siblings keep the house. The wives receive their statutory one-half at fair value. Nobody takes a haircut to a fire-sale.
The family avoids $100,000 to $200,000 in transaction costs, preserves the Proposition 13 base on the 80% sibling share, and closes the probate without a lis pendens, without public filings, and without a court-ordered auction. The relationships survive. The house stays in the bloodline. The widows leave whole and fairly paid.
What the family loses by waiting. Every month that passes with the ownership unresolved is a month of daily accrual — property tax, insurance, mortgage — paid against a distribution the statute has already decided. The §10810 fees grow. The §9000 creditor window closes on claims that should have been posted. The relationships ossify.
What the family gains by acting now. Correcting the record early — filing two Spousal Property Petitions on the 50% theory, opening formal probate on the sibling residual, and offering each widow a buyout at appraised value — resolves the estate in 12 to 18 months, preserves the tax basis, preserves the home, and preserves a family that might otherwise never speak again.
That is what this package is for.