Hello sedderick,
Just like you said money is required for a family to be happy and the incident or scenario of your cousin you gave is a classic example. In developed communities where the family earn a lot by working comfortably you wouldn't see this situation but in under developed part of the world where the best chance of riches is travelling to Europe or North America, this becomes the only option. You stay and build no future for yourself and children or you move abroad to help sustain you lineage