Yes, Ross (played by David Schwimmer) and Monica Geller (played by Courteney Cox) are indeed siblings in the TV show "Friends". Their relationship can sometimes seem confusing, especially in the early seasons when the full dynamics of their family ties are not yet explored. However, throughout the series, the sibling relationship between them is often used as the backbone for various plot points and episodes, and many charectristic childhood stories are shared to underline this aspect of their relationship. The other friends are not related to Ross and Monica and just live in the same building, already being friends before they started living together. Monica shares her apartment with Rachel Green (played by Jennifer Aniston), and Chandler Bing (played by Matthew Perry), who is Ross's college friend, lives across the hall with Joey Tribbiani (played by Matt LeBlanc). Phoebe Buffay (played by Lisa Kudrow) is Monica's former roommate and also part of their close-knit group. To add to the intrigue, as the series develops, romantic relationships form between some members of the group. However, it's the tight bond between Ross and Monica as brother and sister that often serves as an emotional anchor in the series. From their very specific dance routine to the constant bickering about their shared past, their sibling status is a key cornerstone of the Friends show. Enjoy watching the series!