Classical Ancestral Kinship Terminology
Here's the kinship terminology for the Ancestral language! Ancestral kinship is a modified version of Iroquois kinship, where the same gendered siblings of your parents/grandparents share the same term, while separate gendered siblings of your parents/grandparents have differing terms. Diluvians as a species are pretty sexually monomorphic, and biological sex isn't immediately apparent until a diluvian reaches sexual maturity. And in once you do, whether you have male or female sexual organs is largely irrelevant. Your sex is defined as being either homoecious (having both male and female organs), or monoecious (having either male OR female sexual organs, but able to switch when necessary). In Ancestral culture then, your gender isn't dictated by your sex , but by your parenting role; for Ancestral diluvians, the distinction is "mother" vs. "father" instead of "female" vs. "male". Since both homoecious and monoecious diluvians are capable of both gestation and fertilization, the roles are defined as which diluvian gestates (the mother) and which fertilizes (the father).
In Ancestral society, adults are expected to reproduce at least once in their lifetime, and so it is likely that one's parents' siblings have reproduced as well and knowing which term to refer them as will be based on that fact (e.g. if one's mother has a sibling who gestated a child, they would share the same gender of "mother" regardless of biological sex and, as far as kinship is concerned, would be referred to by the same term). Since these terms only are regularly applicable to adults whom have reproduced, you only see these distinctions in generations prior to the ego. In concurrent and future generations, the distinction doesn't matter. This is a remnant of the Proto-Ancestral kinship system, which was a Hawaiian kinship system. For in-laws, the term you'd refer to them as should reflect the term for your blood relatives. Your mother's sister is called "mother", so her spouse would be "father". Your mother's brother is called "uncle", so his spouse would be "aunt". And so on and so forth.