Act as a TikTok content strategist with 5+ years of experience in viral trends. Create a list of the top 5 TikTok challenges specifically designed for siblings to participate in together. Each challenge should be [funny/creative/engaging], suitable for [ages 8-18], and have the potential to go viral. Include a brief description of each challenge, the required [props or setup], and tips for maximizing engagement (e.g., hashtags, music suggestions). Ensure the challenges are safe, easy to replicate, and highlight the unique bond between siblings. For example: 'The [Blindfolded Sibling Makeover Challenge] where one sibling is blindfolded and tries to apply makeup on the other.'