The law has a curious concept called “standing”. Meaning, you stand for yourself. You can’t stand for someone else. This comes to play in a lawsuit when you try to sue to enforce your right, but then it turns out that it’s not really your right that your trying to protect but rather someone else’s right.
If you’re going to try to sue me for walking on your grass, or, say, infringing your patent, the courts won’t look too kindly if it turns out that the grass (or, in this case, the patent) doesn’t actually belong to you. Oops.