In Ketubot, 103a the text discusses what the "et" words include in the phrase כַּבֵּ֥ד אֶת־אָבִ֖יךָ וְאֶת־אִמֶּ֑ךָ
Each et refers to another spouse of the parent so the non-biological step parent is included.
The gemara then explains what it calls an extra vav: וָיו יְתֵירָה לְרַבּוֹת אֶת אָחִיךָ הַגָּדוֹל
The extra vav is to include your older brother.
Rashi explains that the vav referred to is דואת אמך the vav on the "et" in v'et imecha.
To say that the vav is extra indicates that without it, the text would be sufficient. In fact, the Schottenstein posits that the phrase could have been כַּבֵּ֥ד אָבִ֖יךָ אִמֶּ֑ךָ (Honor your father, your mother).
But without a conjunction, the phrase is not clear. What does "honor your father, your mother" mean? Are there other examples where a verb is applied across items that are not connected by a conjunction (especially after a tzivui verb)?
How is the vav superfluous?