Is it time?

My older sister has always tried to get the easy way out. And ever since she had her son. She has been taking advantage of us by taking care of him. More than what she does. She'll go out and leave him with us. I feel more of a parent to him than I bet she is to him. Well last night I got really ticked off. She went out and my parents told me to call her to come home. She said she was at the park and I said "so you need to come home now." And then she calls me and "idiot" and I reply back "don't you mean you? Who's the one leaving their kid behind acting like they got better things to do?" We got into it for a little while 'cause she stopped replying over text msg. I've never really had to guts to tell her straight forward what I think of her since she's my older sister. So would it be a good idea to just tell her off and hope that she changes? Any advice?

You are right, your sister needs to take care of HER son. You don't have to go off on her but you can talk to her and tell her she needs to be a role model for her son. She should not be calling you an idiot since you are kind enough to put up with her. If she doesn't understand you saying it politely then you have no other choice but to be blunt.

Most women have post natal depression and it can get really really bad where they feel worthless, depressed, and just angry at themselves or others. She sounds like she's not ready for her child and she's got noone to help her out except you guys, Cut her some slack. It's really 24hrs of a nightmare taking care of a kid on her own. I bet her husband isn't helping either? She just needs some time to be herself, to be away from all the dirty diapers, crying, cleaning...etc..of parenting. Break it to her gently.........

There's no reason why you shouldn't say what you feel. There is nothing special about your sister that you should hold back what you are thinking. She's a human the same as you are so let her know what you wish to tell her.