My elves are hermaphrodites, but they need another partner to actually reproduce. Their pregnancies last for about two years, and pregnancy is very physically tolling. They usually give birth to one child, rarely two, never more. Not only that, but these elves are pretty sickly, and they have to take a ton of precautions to keep their infants from dying. It also takes 35 years for the children to mentally mature, and their lifespans are 500-900 years. In case you're curious, it's 40 years to physically mature and they aren't considered sexually mature until 45 years.
There's no homophobic folks or sexism in their society seeing as they're all considered one gender (unless they identify more with human genders).
They are also strong believers in the whole 'it takes a village to raise a child' type thing, which means that nuclear families are practically unheard of.
All this in mind, what would their family units look like? How many people would care for the children and pregnant people? What kinds of bonds would be formed?
Clarification: they are not nomadic. They live in cities nowadays just like humans. I'm asking about immediate and/or extended family, depending on the structure, and it's not matriarchal or patriarchal seeing as they don't really get those concepts.