Final answer:
A Yanomamo son-in-law who hunts with his wife's parents is performing brideservice, a form of marriage compensation where he provides labor to his wife's family to compensate for their loss and strengthen familial bonds.
Step-by-step explanation:
A Yanomamo son-in-law who hunts with his wife's parents is engaging in brideservice. Brideservice involves a transfer of labor from the groom to the bride's family as a form of marriage compensation. It differs from bride wealth, which is a transfer of material and symbolic value. The labor provided by the son-in-law compensates for the bride's family's loss of their daughter's labor and offspring to the groom's lineage. This arrangement can continue for months or years and helps solidify the alliance between the two families.