Only if your invite noted a plus one.
Only immediate family members are invited (nieces/nephews).
Yes, in our backyard for the ceremony. The reception is indoors.
The wedding will have street parking only, but there are two nearby cul-de-sacs. It should be good to go, but carpooling is suggested. The reception has lots of parking and your vehicle can be left in the parking lot over night if you are unable to drive due to alcohol or fear of potholes.
Unknown.
No, this is a rumour.