Speaking as someone who grew up with a parent who talks while eating, I've been splatted before.
Please don't talk while eating, or at the least, make sure the food is firmly lodged in your cheeks and not still on the tongue before speaking.
Reminder that the older sister knows the guy shes trying to hook up with is the one her sister loves, whereas the younger sister didnt know the reverse.
Give your support to the one that didnt contribute to the confusion in order to take advantage.