I know for a fact that’s not true because when I was in Japan I saw some wild monkeys being cared for and they specifically had signs on the all showing the family trees of the different monkeys being cared for and explaining how the families all worked
One of the things mentioned was that the grandparent/parent/child units would all work together more closely with each other than non-family members, though they were more collaborative overall than humans
Also elephants come to mind as a non primate mammal
I would say that humans have grandparents due to the nature of human mating and offspring.
Yes, they can help care and give wisdom. Directly linked to why we get that old.
Edit: apparently, other primates have grandparents too.
I know for a fact that’s not true because when I was in Japan I saw some wild monkeys being cared for and they specifically had signs on the all showing the family trees of the different monkeys being cared for and explaining how the families all worked
One of the things mentioned was that the grandparent/parent/child units would all work together more closely with each other than non-family members, though they were more collaborative overall than humans
Also elephants come to mind as a non primate mammal