We love kids, but if the invitation does not specify that your children have been invited then unfortunately they are not allowed as we want a minimal kids wedding.
Yes- there will be people to drive those who need to the hotel that we will have booked for those interested. Otherwise there is also Uber services.
If on your invitation it says Guest, then yes you are more then welcome to bring a guest.
The dress code is casual. Whatever you feel comfortable in we are good with. The only people needing to be more dressed are immediate family.