(My sister, btw, had it wrotten into the marriage contract that she would be the only wife.)
Just out of curiosity, how does that work?
I'm curious, because fidelity is generally a condition of marriage, regardless of relligion.
If he one day decided to get another wife, what recourse would your sister have? My understanding is that it's a Muslim man's right to have up to 4 wives, according to the koran. Would her preferences override the koran?