your sis in law is very buay zi dong.... but you also have to put into consideration of your husband's feeling when you make some decisions la...
guys hate to be stuck in between, if not its not only just about how much you hate your SIL la.
kan kai yi dian, dont be too bothered by the small details, everything will be fine. sometimes the more you mind the details, the worse it will become. because there is already tension between all involved parties.
only when you start to omit details, you will start to give room to the rs. the tension will reduce and people will start to realise that it might not be so bad after all. over time things get better. its like that one... somebody has to take the initiative.
i kind of disagree with some, but thats my personal opinion la... no point hard bang hard. you can do it at the fit of anger, but the person who ultimately suffers is someone closest to you. and when you do this in front of your kids, i do know a few examples of karma. (i not implying anything ah... just sharing)
very often we (us and our in laws) find ourselves in a very hard to get along situation. we get all troubled because of who never say hi to who, who never wash who's clothes. sad and gloomy everyday. so much so that mother dont talk to son, son dont talk to sister. you really want that to happen to your husband? i'm sure not. and all the above mentioned problem lies with just opening up. i also understand that some older people can be quite stuck up. give them more time, after all if not because of them, you wun meet your husband ma.