David uses this rhetorical question to emphasize that they are related. This can be written as a statement. Alternate translation: "You are my flesh and my bones." (See: [[rc://en/ta/man/translate/figs-rquestion]])
Here David speaks of them being related by saying that they have the same flesh and bones. See how you translated a similar phrase in [2 Samuel 19:12](../19/12.md). Alternate translation: "my relative" (See: [[rc://en/ta/man/translate/figs-metaphor]])