Extended families exist. There are no intrinsic advantages or disadvantages to them.
There may be advantages or disadvantages to having your extended family live close by, or even in the same house. The advantages relate to available help and emotional support. The disadvantages relate to living in close quarters with others and having to "get along."
they are mostly extended families depending on how large the family is.
The way Bantu families were organized was extended families
horizontally extended: mum, dad, children, aunts and uncles vertically extended: mum, dad, children, grandparents
no
gay and lesbian families have no advantages, but depending on where they live, they may experience disadvantages and challenges that other families do not have to worry about.
advantages of child headed families
They had extended families to help do household chores and farm
Yes, there are several extended families that live together in Puerto Rico. The families help each other with bills and food.
They had extended families to help care for the kids if the parents are sold as slaves.
People in Mozambique live in extended families because it is part of their culture to do so, and because by doing so they can get by with less individual income.
because they are muslims and muslims like bombs
There were extended families in industrial civilization. However, in the last hundred years or so, they have became more spread out, gegraphically, and had less direct impact on their members.