trace along the family tree, one step at a time, and then concatenate shortened forms of each stepwise relationship. the shortened forms simply take the first syllable of existing basic kinship terms.
example: your mother's sister's son's daughter would be your mosisonda
What exactly is considered basic here? Do terms like “half-sister”, “step-mother”, “godfather”, or even “grunkle” count? Would a stemomo actually be a fawimo? Would a hasis be a fada, or perhaps a fathexda for specificity? Are we calling the Godfather go now?
i left that open on purpose to increase the flexibility of the system. what counts as basic is up to you. many relations will have multiple valid terms