Final answer:
The correct verb conjugation is 'almuerza.'
Step-by-step explanation:
In the sentence, 'Mi padre (almorzar) todos los domingos con mis abuelos,' the correct verb conjugation is almuerza.
'Mi padre' is the subject, which is singular third person, so the correct conjugation is 'almuerza.' If the subject were plural, it would be 'almuerzan.'
So, the correct sentence would be: 'Mi padre almuerza todos los domingos con mis abuelos.'
Learn more about verb conjugation in Spanish