Final answer:
The correct conjugation is 'van' to complete the sentence
Step-by-step explanation:
The correct conjugation to complete the sentence is van.
In this sentence, the subject is 'Los abuelos y ustedes', which means 'The grandparents and you all'.
The verb 'ir' (to go) is conjugated to match the subject, resulting in 'van'.
Learn more about Spanish conjugation