Where does “sisterkin” come from?

sisterkin (English) comes from English kin, from English fictionkin, from English fiction, from Middle English ficcioun, from Old French ficcion, from Latin fictio, from Latin -tiō, from Latin dissertātiō — small stone, pebble; gravel, rubble.

Ancestry of “sisterkin”, step by step

sisterkin traces back through two separate lines of ancestry.

via English kin

StepLanguageWordMeaning
1EnglishkinRace; family; breed; kind; Persons of the same...
2EnglishfictionkinAn individual whose personal identity is based in fiction of some kind: a fictional character, a fictional race or species, etc
3EnglishfictionLiterary type using invented or imaginative...
4Middle EnglishficciounAn invention or fabrication
5Old Frenchficciondissimulation, ruse, invention
6Latinfictiofashioning, forming, formation; fiction
7Latin-tiōtion, -ation, -ing
8Latindissertātiō(spoken) dissertation, discourse, disquisition
9Latindissertusarranged, disposed; explained
10Latindissereresecond-person singular future passive indicative...
11Latindis-asunder, apart, in two; reversal, removal;...
12Latincalceusshoe
13Latincalxlimestone; chalk; the finish line
14Ancient Greekχάλιξsmall stone, pebble; gravel, rubble

via English sister

StepLanguageWordMeaning
1EnglishsisterA daughter of the same parents as another person;...
2Middle EnglishsusterA sister or step-sister; a female sibling
3Old Englishsweostorsister
4Proto-West Germanic*swestersister
Every word from Ancient Greek χάλιξ