I am going to put my visiting house mouse down on the form, he/she will certainly be here on the night of the 27th ----- do I give a toss about the outcome in 100 years time.? MIght put my little JR down as well.
Seriously tho , I do know someone very well indeed who has never ever completed a form or been included on one -- what has happened to them ---- sweet FA.!
as long as you describe your mouse as one of your offspring as the address you have to give is yours.....and then you can add the relation bit........should be fun