I think it is that one: 8. FOR PROVIDING SUPPORT TO OR BEING A DEPENDANT OF A PERSON WHO HAVING RESIDENCY IN THAILAND (NON-O)
Not sure though, since the words used under 4 do not all make sense to me: "In case the applicant’s family is a foreigner with a permit to reside in Thailand:
residency certificate, alien registration certificate, work permit, a copy of passport and house registration". Never heard of an alien registration certificate. Work permit can't be a must, just an option, since the title says "FOR PROVIDING SUPPORT TO [...] A PERSON WHO HAVING RESIDENCY IN THAILAND".
https://bangkok.immigration.go.th/wp-content/uploads/2022C1_08.pdf