How to send a thank you note to a family

Hello, I think one to the whole family/household should be fine.

I wrote one thank you note to the whole family in cases like these

Thank you both!

If the children live in the same home, I would send one. If they live separately, I would still send separate ones so each household has 1.

Etiquette says one thank you per adult but you can easily send one to the whole house addressed to all.

The only situation that would necessitate 1 per adult is if the gift is something that clearly included contributions from everyone (like a several hundred $ gift). If it is more likely that the parents signed for everyone then, even if it goes against technical etiquette, one should be just fine.

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Yeah it was clearly that the parents signed it on behalf of the children, one of them is estranged from the family so I definitely know he wasn't involved in the purchasing of the gift