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Hi there, Welcome to the forums. Sibling rivalry (also known as littermate syndrome) is a real thing and the main reason why many breeders and shelters have started no longer sending two puppies together in new homes. The puppies tend to bond a lot together and they may get into frequent squabbles as they mature and separating them may become problematic once they are deeply bonded. It seems like several dog owners encounter more problems when the puppies are of the same sex versus having one female and one male. However, it is also true that there are many sibling pups of the same sex living together happily, therefore there may be too many variables to make blank statements. I have personally raised two littermates (my Rottweilers) one female and one male and can say that it takes a lot of work because you'll need to separate them e.g. separate sleeping (initially starting with separate crates kept side-by-side, then gradually increasing distance), separate training, separate socializing, separate walking, so to help develop their individual personalities and prevent raising two "half-dogs' who depend too much on each other and risk failing to bloom and who may also learn to not pay attention to us. It is therefore best to start this early as it may become more difficult later on. These separation periods do not need to be an all-day ordeal for days or weeks. What counts is that the pups are separated for periods of time during the day, including nap times (one owner spends time with one puppy, while the other spends time with the other, and then possibly swapping) with the purpose of building a strong bond with each pup independently. While you are initially training them individually a lot, once they have a solid response to sit, down, come, etc, it is possible to work with them together every now and then to your advantage. For example, I like to have sibling pups sit before they are fed their meals or sit before I open a door to let them out to potty. I also like to dorecalls with them together when needed. This type of training teaches the pups to pay attention to us despite the distraction of being together and in my opinion is very valuable.