Wat an appropriate tip if u came with 5 adults and 2 kids

You Dont have to! They tell you , is up to you.

20% is normal, I usually do 10 to 15 dollars per guest

Yes that is fine

I'd say 20% unless you felt that something deserved more than that.

20% of what you paid for the meal.

20%of the bill

20% of your bill.