Upvote:1
Ask the person at the kiosks. Clearly state that you're both traveling together under different visas and ask what you should do.
Make this clear the CBP officer also. The officer will likely want to know why a B1/B2 visa holder are traveling together and will also likely wonder how the start of your visas/travel dates correlate with one another.
Since you're traveling with a family member who is under a different visa, my advice is to just ask the person at the kiosk. Make it clear that you're traveling together but are either parting ways or staying together after immigration control.