[sc_rufctr]

Ones Ethnic back ground can have a big influence on when it's appropriate for a child to move out.
For instance people from a Southern European back ground often live with their parents until they marry.
And if they don't marry it's not uncommon for them to live with their parents into their thirties and beyond. This is considered perfectly normal and acceptable.

So it's probably best not to judge a family from the outside.