The total cost for tickets for the whole family is $79.50.
To calculate the total cost of tickets for the whole family, you need to determine the number of adults and children in the family.
Let's say James is a child, and Evan, his brother, is also a child. So, there are two children in the family.
Tickets for children cost $17.25 each, and there are 2 children, so the total cost for children is:

Now, let's assume there are two adults (James and Evan's mom and dad).
Tickets for adults cost $22.50 each, and there are 2 adults, so the total cost for adults is:

To find the total cost for the whole family, add the cost for children and adults:
$34.50 + $45.00 = $79.50
So, the total cost for tickets for the whole family is $79.50.