Do you (not) observe this both with males and females?
Baboons are supposed to be a good model for human social structure, though not as smart as apes. They are matrilocal, so they don’t know how big the male’s family was. The female’s status is largely determined by alliances, which are made of family blocks. They do get some grooming work out of allies. They might be able to get work out of low status females, who love to hold high status babies, but the mothers don’t trust them, perhaps out of fear for the baby, perhaps out of fear of status contagion. Anyhow, since (2) is true, it’s hard to measure (1). But it is probably better to look at anthropological evidence than baboons.
Large families mean low infant mortality and low maternal mortality. Low infant mortality might be due to good genes, or good provisioning. A woman from a large family might provide genetic protection against maternal mortality, but not a man from a large family. If infant mortality is due to bad infant genes, siblings testify to this kind of gene, but it might not be different from other kinds of robustness that can be measured in adulthood. If it’s paternal provisioning, then maybe it’s evidence that the man inherited dad strategy genes (vs cad strategy), but hunter-gatherer couplings probably were not long term so the large family is not highly informative. The farming environment seems like it should select for the behavior you suggest, but people usually assume it didn’t last very long so didn’t shape much.
Do you (not) observe this both with males and females?
Baboons are supposed to be a good model for human social structure, though not as smart as apes. They are matrilocal, so they don’t know how big the male’s family was. The female’s status is largely determined by alliances, which are made of family blocks. They do get some grooming work out of allies. They might be able to get work out of low status females, who love to hold high status babies, but the mothers don’t trust them, perhaps out of fear for the baby, perhaps out of fear of status contagion. Anyhow, since (2) is true, it’s hard to measure (1). But it is probably better to look at anthropological evidence than baboons.
Large families mean low infant mortality and low maternal mortality. Low infant mortality might be due to good genes, or good provisioning. A woman from a large family might provide genetic protection against maternal mortality, but not a man from a large family. If infant mortality is due to bad infant genes, siblings testify to this kind of gene, but it might not be different from other kinds of robustness that can be measured in adulthood. If it’s paternal provisioning, then maybe it’s evidence that the man inherited dad strategy genes (vs cad strategy), but hunter-gatherer couplings probably were not long term so the large family is not highly informative. The farming environment seems like it should select for the behavior you suggest, but people usually assume it didn’t last very long so didn’t shape much.