Cambly students are from around the world, oftentimes from countries with vastly differing cultural norms! Although this is wonderful in many respects, it also means you may encounter cultural norms that may be surprising to you.
This might include excessive compliments, questions about the your age or marital status, connecting with shirtless male students in Brazil (where it's culturally normal to be shirtless at home), or connecting with driving Saudi's (it seems dangerous, but it's normal there!).
As with any culturally diverse workplace, it is important to be tolerant of cultural differences and remember that students may not mean any offense. However, if you feel that the conversation is too uncomfortable for your liking, you are welcome to change the subject: "Actually, I would rather not speak about that. Why don't we talk about your family?" or even very politely end the conversation.