My partner dislikes my sister's boyfriend, because one time we were at their flat a few years ago, my sister had us over and she was talking to us and her boyfriend came in from work in a foul mood and complained the glasses and crockery wasn't washed so he stacked two glasses together and smashed it with his fist, followed by riping the moblie phone charger's line from it's plug.

My partner got really angry and chased the boyfriend into the back yard, held him against the fence and told him never to do that again in front of us.

It took a few months for things to go back on friendly terms. He treats my sister better I can say since that altercation.

So my partner is almost likely to flip once the news is announced. She is approx 9 weeks now. :-)