Unblock iPad/iPhone from connecting to Wi-Fi?

My brother blocked my iPad and iPhone from connecting to Wi-Fi, how do I unblock this?

Added (1). No he didn't turn Wi-Fi off, he just blocked me somehow. He didn't change the Wi-Fi password either. He somehow went into the router settings and blocked me, so how do I go into router settings and unblock me. I'm using iMac with an apple airport router.

How he blocked? There's no way to block did he simply turn Wi-Fi off?

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