We’re looking to get it fixed ASAP, thanks for all the bug reports, we appreciate it. I just wanted to acknowledge that the Want to date a family member is something we know about, we’ve reproduced ourselves, we’re working on it. To make things more awkward (and potentially illegal), this can happen to Sims at the toddler and child stages. According to some players, a glitch has existed in the game for years that allows family members to gain romantic sentiments and bars with each other. This isn’t the first time that a bug has caused families to romance each other. Strangely, this even happens to Sims that are happily married. So, after installing the update, you may find that your Sim wants to date their brother or parent. Unfortunately, there was an issue with the implementation, and the game generated Wants without regard to familial relationship, marital status, or sexual orientation. Each Sim has a number of goals they want to achieve and things they want to avoid. This update replaced Whims with a feature similar to the one found in The Sims 2. The issue stems from the Wants and Fears system that EA added in the July patch.

Fortunately, the bug causing Sims to want to enter a relationship with their family members doesn’t mean they actually can. While there are mods that add incest to The Sims 4, making WooHoo with your family is typically a big no-no in the base game.

Sims 4 up to date incest mod