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One of the fundamental values we learn as children is never to use another persons belongingswithout their permission.

Doing so is a form of theft, yet some people cant seem to grasp this principle.

The author oftodays storyexperienced this from his sister-in-law, who began using his skincare productsbehind his back.

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To make matters worse, everyone blamed him when theentitled womanexperienced an adverse reaction.

Thepassive-aggressivetreatment from everyone around urged the author to consult the AITAH subreddit for answers.

As licensed marriage and family therapistSophie CresstellsThe Independent, it is primarily due to feelings of jealousy and competitiveness.

Teen applying skincare product, with tattoos visible on arms, in a tiled bathroom.

Sisters-in-law may come from various families, each with their own set of values, customs, and expectations.

These differences can lead to misunderstandings and stress, she said.

Cress explains that people typically have an ambiguous relationship with their spouses parents, which doesnt bring much friction.

Text about a family gathering involving a teen and his SIL using expensive skincare.

However, their situation did not need to escalate to the heated levels that it did.

A simple talk can often uncover misunderstandings and clarify the air, she stated.

However, taking a stand may be the best move when people begin to take sides.

Text discussing teen’s commitment to skincare routine, mentioning past skin issues and essentials packed for two-week trip.

In doing so, family therapistLaurie Carmichaelurges a brief and direct approach.

Theres no need for fluff or apologizing.

Just get to the point in a clear, kind way, she said in an interview withTime Magazine.

Text discussing sharing a room with a niece, mentioning an en-suite bathroom and organizing items on a shelf.

He must state his case sternly and respectfully to clarify his side of the story.

Whether everyone listens or not is beyond his control, but taking action is necessary.

The author answered reader questions to provide more information

Thanks!

Text about a teen refusing permission to SIL to use expensive skincare products.

Check out the results:

Woman in a striped shirt looking frustrated, referencing skincare misuse consequences.

Text about SIL accidentally using salt water instead of expensive skincare, leading to skin issues and regret.

Text conversation about expensive skincare usage and regrets following unauthorized use.

Text discussing expensive skincare conflict with SIL, family reactions highlighted.

Teen covering face with hand, frustrated about someone using his expensive skincare.

Text about a conflict over expensive skincare use, resulting in arguments and feeling ignored.

Text clarifying family confusion related to SIL.

Text explaining potential skin reactions with daily salt water exposure and product use.

Teen crosses arms in annoyance while woman gestures, connected to expensive skincare issue.

Teen in a white shirt talking, holding a grape, seated at a table in a bright kitchen setting.

Reddit discussion about expensive skincare and advice on talking to a dad.

Reddit conversation about skincare causing classism and bigotry concerns.

Reddit comments about a teen’s expensive skincare being used without permission.

Comments discussing misuse of expensive skincare and its drying effects.

Reddit users discuss safe skincare practices for piercings in a comment thread.

Reddit comments discussing skincare and usage consequences of expensive products.

Reddit comments discussing skincare and piercings, mentioning costly consequences.

Reddit comments discussing teen’s issue with SIL using expensive skincare without permission.

Reddit conversation about SIL using expensive skincare without permission.

Reddit conversation discussing a teen’s expensive skincare being misused by their SIL.

Comment discussing a teen’s expensive skincare being used without permission and the ensuing complaint.

Reddit comment discussing a 29-year-old stealing skincare from a teen.

Reddit comment discussing expensive skincare and a SIL using it without permission, causing regrets.

Reddit comment advising protection of expensive skincare.

Reddit comment discussing regret over using expensive skincare without permission.

Text on screen about using expensive skincare without permission and its consequences.

Comment discussing SIL and expensive skincare conflict.