Technically In-laws incest of, Forry and Sokia(Nahir's Mum), and Lilan and Edva (Seamstress and her Mother in law in Oryeonguk) also counts as incest.
adverb:
technically
1.
according to the facts or exact meaning of something.
So,
technically it absolutely does not count as incest.
Technically incest is only with direct blood relations. Specifically consanguinity.
Under Patreon rules step sister\Mother, in-laws, anything connected counts. But by actual definition, it's only direct blood relatives who share high enough % of DNA to qualify as incestuous.
An identical twin shares 100% DNA with their sibling.
A non identical sibling shares 50%, the same as a parent & child do.
A blood Aunt or Uncle share 25% with their niece or nephew.
A cousin shares 12.5%.
An Aunt or Uncle by marriage share 0%.
An in-law shares 0%.
That's why cousin marriage is legal in a lot of places, because the amount of DNA shared is not quite high enough to have the distinct probability of adverse impact on their children.