Blocking Numbers via iMessage

Hey guys quick question..

I don't want a number texting my kid. I've got my iPad setup with the same Apple ID and Number just so I can have the ease on watching over my children's texts.

I blocked a number earlier that seemed to stay blocked which was great.. I accidently unblocked it then reblocked it, (I can see the convorsations via iMessage), it shows my kid's text messages responding to a text I don't get on my iPad since I've got the number blocked, though when I unblock it I can see they're clearly texting still.

How do I fix this?

 

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