CAS Marriage Fix
There is nothing more frustrating than spending hours perfecting a Sim's appearance in Create-a-Sim, only to exit and discover that the game has quietly annulled their marriage. It is a jarring, silent betrayal that strips away spouse status, in-law connections, and step-relations without a single warning popup. The CAS Marriage Fix by deadlystingnyc is the definitive solution to this maddening EA bug, and it works seamlessly with the latest patch.
The Silent Marriage Killer in Create-a-Sim
This is not a problem caused by your mods or your playstyle. It is an EA bug that has been reported repeatedly and remains unfixed as of the August 25th, 2026 Patch (PC/Mac: 1.127.41). Players across different worlds, save files, and pack combinations have all experienced the same heartbreak. When you take a married couple into CAS, the game's internal record for your Sim gets corrupted. The spouse pointer, the data link that tells the game "this Sim is married to that Sim," is set to zero.
When the household reloads, the game compares that empty pointer against the family tree. It sees a discrepancy, concludes the Sim is not married, and deletes the marriage to match its faulty data. The result is a family tree with no spouse, a relationship panel that reads "Partner" instead of "Spouse," and a complete demolition of all in-law and step relations. There is no notification, no archive, and no undo button. Once you save, the loss is permanent.
How the CAS Marriage Fix Works
The genius of this mod is its timing. The CAS Marriage Fix for The Sims 4 intercepts the game's loading process at the exact moment your Sims return from CAS. It reads the family tree, finds the spouse pointer that the game lost, and restores it before the game's faulty comparison can trigger. The mismatch never occurs, so the marriage is never torn down.
It is important to note that your Sims will still show as "Partners" while inside CAS. This is expected behavior. The pointer is already gone at that point, and the mod repairs it on the way back out. You will only see the correct "Spouse" status once you exit CAS and the household loads normally.
What This Mod Cannot Do
While this mod is a lifesaver, it has limits. It cannot recover a marriage that was already lost and saved. Once the family tree link is gone, there is nothing left to restore from. You must use a save file from before the loss occurred. It also does not fix the underlying bug in the game's own CAS code; it simply prevents the damage from happening. Finally, it only restores a marriage when the spouse pointer is missing entirely. If a Sim's pointer names a different partner, the mod will leave it alone.
How to Install the Mod
Installing this fix is straightforward. First, download CAS Marriage Fix from a trusted source. Then, unzip the downloaded file. You should see a folder named deadlystingnyc_cas_marriage_fix. Drag this entire folder into your Mods directory, which is typically located at Documents/Electronic Arts/The Sims 4/Mods/.
Once the folder is in place, launch The Sims 4. Navigate to Game Options > Other and ensure that "Script Mods" are enabled. If your game was already running, you will need to restart it completely. The mod is safe to add or remove at any time. Removing it simply restores the game's default, buggy behavior.
Compatibility and Performance
The mod is tested and compatible with the August 25th, 2026 Patch, covering both PC and Mac versions. It requires only the base game; no expansion or game packs are needed. In terms of technical compatibility, the mod patches the family_tree_service.push_sims_to_graph method. If you use other mods that replace this same method, there may be a conflict. Always check your mod list for overlapping functionality.
For players who want a streamlined experience, the foxygame.net launcher offers a one-click install for CAS Marriage Fix, automatically placing it in the correct folder and checking for version compatibility so you never have to worry about manual file management again. This launcher also maintains a catalog of add-ons, making it easy to discover and update your mods. It even handles auto-updates, ensuring your CAS Marriage Fix stays current with future game patches.
Final Thoughts on Protecting Your Sims' Unions
The CAS Marriage Fix is an essential tool for any Sims 4 player who values family storytelling. It addresses a critical flaw that can silently destroy hours of narrative progress. While we wait for EA to officially patch this bug, this mod is the only shield between your Sims and a broken family tree. Download CAS Marriage Fix today and ensure that your Sims' vows remain intact, no matter how many times you tweak their nose or change their outfit.