Wǒmen qù tànfǎng le zhù zài xiāngxia de lǎonǎinai.
We went to visit grandma who lives in the countryside.
Tips
usage
探访 implies a purposeful visit, often with a sense of discovery or investigation. Journalists 探访 places for stories; relatives 探访 elders out of respect. More formal than 看望 (to visit/check on someone).