For the shop, you order the plate/bowl ONLY. no drinks.
Anyone looking to feed more people will just place 2 separate online orders. Or do an online order and do an in person order after finishing the shop as an online order. If we are dining inside, i will have wifey just go to the counter and order her and the kids food. Then I do my in-person shop as a stand-alone.
It's not complicated to complete the shop and still get other things in addition as separate interaction.
I have done restaurant shops where they only say 2 people are allowed. If we choose to go as a family, I will put my kids at a separate table next to me or behind me and let them handle their own stuff. I don't have small kids so I can do this. When they were under 10, I could not pull that off.