wp_list_sub_pages will list only pages within the same category (top-level parent) as the current page.
More Plugins
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reCAPTCHA for bbPress
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Loginpetze
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SL Currency Symbol Changer
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Author Post Ratings
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Admin Safety Guard — Login Security, Limit Logins, 2FA & Brute Force Protection
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IP Language Switcher
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WP Logger
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Sitemap HTML Generator
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Multi Site Post Publisher
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Woo Sendy Subscriptions
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Pager Widget
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ONTRAPORT to Wishlist Integration
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ERRP: Enhanced Related Random Posts
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Super Easy Stock Manager
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Text Case Converter
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Endless Posts Navigation
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Optimize More! – Images
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EZ Anti-Spam Comments with reCAPTCHA
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bbPress Reports
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EG-Archives