Do we have to tell family to move on after photos or will they know?

I feel like this isn't something that needs to expressly be planned ahead. Just read the situation day of. After you finish with their photos, you could say something like "thank you! We'll see you at the reception shortly." or something like that if you want.

The family involved in pictures needs to be informed before the ceremony what is going on and where they need to be

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Yeah that is a really good idea. I am a terrible overthinker but given the different venues and short gap I was worried that they would linger or think that we would be travelling with them to the reception (though now that I think about it, I am sure they will not actually expect that).

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We are only taking a few family portraits after the ceremony and I haven't heard of anyone in our circles giving them notice in advance as it is generally expected, though our celebrant will be making an announcement which will communicate to family and friends what is going on.

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What my photographer recommended and requested is a designated family member/bridal party member to sort of corral aunts and cousins after the ceremony for pictures. She also suggested a shot list with names so she or the designated point person can call out those names to make sure there right people are in the shots, and she said it helps a lot if the point person vaguely knows who everyone is. You avoid formal announcements this way, but you also avoid missing shots with the people you wanted.

Our photographer is going to handle this for us. Once he finishes photos with a specific group, he will say something like “thanks a lot guys! You can go enjoy cocktail hour now” 😀

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That's a good idea! I will speak to ours about this, thank you!