Whilst I'm guessing you're pretty upset over this (and who wouldn't be), it's difficult to know exactly what you're asking here. Are you saying that your father in law gave you no say in your wife's funeral arrangements and that the law can't help you?
And you're saying this is your last day? Before what? Jail, or are you contemplating something more permanent or damaging? Perhaps it would help you to chat to someone at the Samaritans. You don't have to be suicidal and they may be able to refer you to more specific sources of help and counselling. Their number is 08457 90 90 90.