First of all if you are trustworthy enough to be left home alone then spanking should have boarded a ship and sailed away a long time ago. So you did act a little irresponsible but its not worth them making a mountain out of a molehill that is for certain. I would stand up for myself and if you think that it is what needs to be done then you should too,,,just don't wait until you are angry to do it. Talk to them after everyone is calmed down and try to create some personal boundaries