Apple family plan storage if different iClouds
If I am on a Family plan will my kids have access to the upgraded storage if they have separate icloud accounts
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Yes. That's the entire point of Family Sharing.
You can share things including iCloud storage with other family members that have different Apple IDs.
Make sure the accounts are being used for both iCloud and the iTunes & App Stores.
If you are sharing Apple IDs for any reason, you are defeating family sharing entirely.
Invite the iCloud accounts to the Family Sharing group so they can use the shared storage.
Click here for details: link-> Share iCloud+ with your family - Apple Support