Quote From: mommy_312A 4 year old shopaholic? Be a Mom... and if you don't want your sister to buy her stuff then let her know if she wants to see her niece then don't buy her anything. As for your daughter, tell her know and ignore her temper tantrums... she will get the picture. YOU ARE THE MOM... you decide what happens with your child. If your child was constantly treated unfairly at school would you just complain about it to other people, or would you do something about it. Just because she is your sister... doesn't mean you can't do anything.
There are way too many "Mom Help" books, online advice and usually friends and family for you not to know the options you can try and figure out which one works. Sounds like you just don't want to deal with or not strong enough to deal with the temper tantrums and just give in.
HUGE MISTAKE to let aunty take over the role of 'mommy'.
When my daughter was young, my sister similarly alienated my daughter's affection from me. At the time, I didn't protest, because she was 'blood'.
All that changed when my daughter became a troubled teen. It was obvious my sister and I had opposite values. She wrongly encouraged my 12 year old daughter to experiment in sex, drugs and alcohol while still living 'in the safety of home'. My daughter became so out of control, I send her to a strict boarding school for teens in crisis in another state. Two times, my sister crossed state lines to kidnap her from her program. My sister and I ended up in court. She sued me for custody of my daughter. I sued her for harassment, the strongest thing available to me at the time. She lost. I won and was awarded a permanent harassment injunction. My sister was not allowed to have contact with my daughter and me for 3 years. This dispute forever split apart our once close family.
Back off aunty!