Depends

they might care more about Great Aunt coz Mum was a drunk who kicked the shit outta him and sold all his toys for more booze, Great Aunt could have stepped in and saved him therefore he'd care more about Great Aunt

*only saying this as I don't have a mum or great aunt, but would shout from the rooftops if her 'birth' mother died*
( diffy maybs, Thu 7 Jul 2005, 16:55, archived)