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The Wingman generally isn't important enough to warrant having a relative be an important character by sheer virtue of being his relative. Sunohara is the exception, not the rule. Also, the Wingman is typically there to make the Male Lead look better by sheer comparison, and giving the Wingman a cute imouto could undermine that.
And in most modern anime shows, the male portion of the cast tends to get rather thin after the male lead and his wingman (if there is even that much to the male portion of the cast).
A cynical answer, I'll admit, but I think there's some truth to my perception here.
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