The only seats left for the game my family would like to go to are listed as wheelchair accessible and companion seats. Are these only available to customers with mobility issues, or can my family sit there?

You might be on the grass, which is just level with the parking lot. There are picnic tables. First come, first served, or you can lay down a picnic blanket or lawn chairs you bring. However, anyone can pretty much sit anywhere. It is pretty casual. Last time I went I sat in the grass, next to two goats someone brought. Anything goes. One goat tried to eat my hat. Another time I went and we shared our picnic table with a family with a wheelchair, right next to the fence near first base. It is very nice.

Yes very much so there is accessible all the way through the park you can roll on at least concrete around the park and then the bark Dust In the Park which is better than the grass and accessible yes they have wheelchair bathroom faucet

We sat in the grassy area last time. I'm talking about the rear seats in the bleachers specifically designated as wheelchair accessible.