If you are injured at a friend’s house, you can potentially sue for damages. You are liable for your own actions if you are on the property without permission, though. If you are there with permission, you can still sue for damages if the injury was not expected. They could also be liable for your own actions if you were injured because of something that happened while on the property. This would be true if you were injured because of something that your friend did or failed to do.
However, there are differing laws as it pertains to premises liability depending on the state you live in. Some require varying levels of responsibility depending on the type of guest and others mandate a more blanket rule. If you have been injured, it’s important to discuss your options with a qualified attorney.
Regardless, although it might be technically possible to sue a friend or acquaintance for damages at their home, deciding whether to actually do so is a different question altogether. Depending on the situation, it might not be the best idea to try and sue a family friend or the like. Obviously, this is subject to personal preference and circumstance.