I have a sister who was nursed with my paternal aunt's daughter; is my paternal aunt's daughter permissible for me [to marry]?

If your maternal cousin (daughter of your mother's brother or sister) is suckled by one of your ascendants (by lineage or suckling) such as your mother or grandmother, or by one of your descendants (by lineage or suckling) such as your daughter or granddaughter, or by one of your sisters, then she becomes unlawful for you [to marry]. However, if your sister and your maternal cousin are suckled by someone other than these, then she does not become unlawful for you.