Woman Says Fiancé’s Sister Copies Everything She Does and It’s Starting to Get ‘Creepy’

At first, imitation might feel flattering — but sometimes it crosses into unsettling territory.

On Reddit, a 30-year-old woman shared that she and her fiancé, 32, are preparing for their March wedding. Her future sister-in-law, 26, however, seems a bit too invested in their relationship — copying nearly everything she does.

At first, she saw it as admiration. “It was harmless stuff — asking where my clothes were from, copying my haircut, even picking up my phrases,” she wrote. “Then she started showing up in identical outfits to events. My fiancé laughed it off, saying she just ‘looks up to me.’”

But things escalated quickly.

“She’s now planning her wedding (to her 8-month boyfriend) at the same venue, with the same caterer, and even hired our photographer,” the woman explained. “When I confronted her, she said, ‘You just have such good taste! Don’t be selfish about it.’”

The strangest part, she added, is that her fiancé doesn’t think it’s a problem. “He says I’m being ‘catty’ and that it’s ‘sweet’ she admires me.”

Eventually, the bride-to-be hit her breaking point. “Last week, I found out she’s even choosing the same first dance song,” she said. “It feels like I’m living in a bizarre mirror world.”

Conflicted and unsure what to do, she turned to Reddit for advice. “My friends say it’s creepy, my mom says I should protect my day. My fiancé thinks it’s all ‘in my head,’” she wrote. “Is this worth confronting again, or am I just overreacting to something harmless?”

In the comments, users overwhelmingly agreed that the sister’s behavior was “definitely weird” — but many were more concerned about the fiancé’s lack of support.

“Obsessive in-laws can destroy your peace of mind, especially when your partner refuses to acknowledge it,” one commenter warned. “Don’t marry someone who dismisses your boundaries.”

Another echoed the sentiment: “If your fiancé doesn’t see this as a red flag now, it could cause serious issues later. Think carefully before walking down the aisle.”

Others offered practical advice: keep details private, avoid sharing wedding plans, and distance yourself where possible. “Info diet time,” one user wrote. “People who know you both will realize she’s the strange one anyway.”