"He acts as the person who cheers the family up once a fortnight."
- "He acts as the person who cheers the family up once a fortnight."
"he acts as the person who ~" 「〜役割を果たす」"He plays the role of ~" も使えます。
"cheers the family up" 「暗い家庭を明るくしてくれる」
"once a fortnight" 「2週間に1度」
"once" 「1度」
"fortnight" 「2週間」"2 weeks" も言えます。