Usually because once you hit your teenage years your mum is uncool.. 'usually' so the next best thing is your aunt :)
Several have a good relationship and several don't. This depends on the aunts and nieces similarities as well as common interests and willingness to be friendly towards each other.
Edith Van Dyne has written: 'Aunt Jane's Nieces in Society' 'Aunt Jane's Nieces Abroad' 'Mary Louise in the Country' 'Aunt Jane\\\'s Nieces in Society' 'Aunt Jane's Nieces Abroad' 'Aunt Jane's Nieces on Vacation' 'Aunt Jane's Nieces at Millville' 'Aunt Jane's Nieces on the Ranch' -- subject(s): lace, oranges, lemons, ranches, racial tension, Southern California, child care, smuggling 'Aunt Jane\\\'s Nieces Abroad' 'Aunt Jane's Nieces on Vacation' 'Aunt Jane's nieces in society' 'Mary Louise and Josie O'Gorman' 'Aunt Jane\\\'s Nieces Out West' 'Aunt Jane's Nieces at Work' 'Aunt Jane's Nieces' 'Mary Louise' 'Aunt Jane's Nieces Out West'
Aunt Jane's Nieces was created in 1906.
Aunt Jane's Nieces Out West was created in 1914.
Aunt Jane's Nieces at Work was created in 1909.
Aunt Jane's Nieces on the Ranch was created in 1913.
Aunt Jane's Nieces on Vacation was created in 1912.
Aunt Jane's Nieces at Millville was created in 1908.
Aunt Jane's Nieces in Society was created in 1910.
Aunt Jane's Nieces Abroad was created in 1907.
Aunt Jane's Nieces Out West has 316 pages.
Aunt Jane's Nieces at Work has 298 pages.
Aunt Jane's Nieces on the Ranch has 276 pages.