Answer:
Mi hermano y yo siempre cenábamos en la casa de mi abuela.
Step-by-step explanation:
This means: My brother and I used to always have dinner at my grandma's. "Cenábamos" is the imperfect of the verb "cenar" and is conjugated in the first person of the plural. The imperfect is used to talk about past habits, or past situations which don't have a precise beginning or end. In this case, it refers to a habit. The translation in English can be done using the expression "used to", which indicates the idea of habit.