It is nice to be able to play multi-player games with your friends. You may also have friends you have met in different states or countries you have visited that you would want to play with. Siblings are also useful and can either compete against you or help you compete against someone else.
You know you are not able to go out anywhere when you are sick. You also would not want your friends to catch what you have and get them sick. It is possible to play with them even when you are lying in your bed with your computer in your lap.
When you are sick, it means you can not do anything except get lots of rest and drink plenty of fluids. If you feel up to it, you can talk to a few friends and decide which online game all of you would want to play. This will give you something to do while you are lying there bored with nothing else to do because you do not have anyone to keep you company.
Another great thing about being able to play an online game with friends, is some of your friends may not be in the same country or the same state as you. It can be hard to spend all of your money on airplane tickets or gas to drive to where they live just for a hang out with them.
It is always nice meeting new people whenever you travel, but the bad part is that you never get to hang out with them unless you spend the money to go stay with them for a week or so. That might not always be a good idea, especially if you just met them. Playing an online game would be a way for you to connect with other people.
If you are really close to your cousins, then you guys might want to talk about competing in a game for fun or as a competition. It is also a major benefit because you are able to chat with them online.
Playing with your siblings can help you work together as a team if you choose to go in that direction, because all of you would be able to team up against other players that you do not know. It will also help you bond more. It will give you a chance to get to know more about each other and find out creative ideas to make it through to the end of the game.
It is a fun experience playing multiplayer games for anyone of all ages. This is a way for you to be able to hang out with your friends if you or someone is sick, it is a way for you to connect with family or friends you have just met or reconverted with, or any other reason you may have as an excuse to go on your computer.