Theoretically, yes.
Not quite that severe, but my brother was 11 years older than me. And my friend's wife has a sister that's about 16 years younger than her.
Once you start factoring in older men having kids with younger wives (like Tony Randall having a kid when he was 76!), there's always the possibility of having a kid when you're young, then hooking up with a younger woman decades later and having a kid that's 20+ years younger than their sibling. And it's even theoretically possible for a woman, if she has her first kid really young (as a teen mom), then has another kid before she hits menopause. That gives the first kid a potential window of about 10-15 years to get pregnant themselves in order for their child to be older than its own aunt/uncle.
"Wall of Text'D!"
--- oldskoolplayr76
"POwned again."
--- blight family