This is not very clear from the documentation

ElegantCoyote26 which documentation are you referring to ?

Do you think this is better ? (the API documentation is coming directly from the python doc-string, so the code will always have the latest documentation)
https://github.com/allegroai/clearml/blob/c58e8a4c6a1294f8acec6ed9cba81c3b91aa2abd/clearml/datasets/dataset.py#L633

https://allegro.ai/clearml/docs/rst/references/clearml_python_ref/dataset_module/dataset_dataset.html#clearml.Dataset.create

Optional[Sequence[Union[str, Dataset]]]None, list of string or list of Datasets objects
(each one is a parent (supporting multiple parents)

well, what are the types of input expected? is parent_datasets a list of names or IDs?