Hee--Kadaj is definitely a picky eater. I can see him being ridiculously fastidious about his food. And Loz is "Hey, it's not moving! I can eat it! :D" Yazoo, yes, waits to see how others react first and then goes in cautiously.
And heh, yup on Tifa. She's of the "either eat what I cooked and like it or cook it yourself" school. Which lead to a lot of terse standoffs between her and Kadaj near the beginning. Luckily, Cloud ate it without blinking, and Kadaj followed his lead. Or else it would have been very, very much like your mom and your brother.