Order of the brother:
• Bacon and eggs --> $3.99
,
• Milk --> $0.95
,
• Pancakes --> $2.55
We add the prices to find how much he spend:

The brother spend $7.49
Your order:
• Chicken -->$4.74
,
• Shrimp --> $4.10
,
• Lemonade --> $0.77
We add the prices to find how much you spend:

You spend $9.61
To find the difference in price between the two orders we substract the price that the brother pay, from what you pay:

The difference is $2.12
Finally, if they split the bill equally, we need to add the two costs and divide them by 2 to find how much each person will pay:

Dividing by 2:

If they split the bill, each will pay $8.55