Confusion about answers about Parents/teens marketing

Hi Brooke,

So grateful you offer this space for us to ask and learn.

I scrolled most of the questions and found the replies to the same question were different. I want to double check with this: Which one should I market for if the teens (high schooler) receive coaching on college admission but their parents pay the bill?

One more question is about FB ads. The teens Iā€™m targeting is the Chinese who study in USA. But they tend to use FB less (more on youtube, ins and snapchat), and their parents use other social media than FB. What would you suggest on this case?