I have found my two sisters will set together and have raised chicks together as co-broodies.I don't know about Tassels or Piglet but I know Silkies share sleeping together, laying eggs together, brooding together ~ & altho I never hatched chicks other Silkie owners said they had Silkie mommas set on the same eggs & co-parent the hatched babies.
Silkies are a sharing bunch:
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But I gave Curly babies last summer and her sister didn’t assist.