Thanks again everyone for your responses. I wasn't expecting as many people to comment.
I'm sorry for not naming people individually but there are a lot of really helpful replies and sources of information, some of which I have already looked at but will look at again.
I'm going to open a thread, maybe later today, on Relationships, as that is more appropriate than here to discuss more fully the whole situation rather than my mother-in-law's choice of card.
One last thing to say on here, though, is, I am scared of my husband. He has never hit me, and I don't think he ever would. He rarely shouts, even, though over the years it has happened more than it should. So, why not go to the police? I shouldn't be scared. But, how can I go to the police for a 'look', or a twitch of the cheek? He doesn't have to hit and he doesn't have to shout. The look and the twitch are enough of a signal for me to know.
Anyway, all that from a post about a bloody card!