hide and seek

We went for a lovely sunday lunch today at our friends house. This is a pic of the 3 girls being discovered behind the curtain whilst playing hide and seek. We had a lovely day even though it included a change of clothes all round as the two daddies (full of g+t's) got a bit giddy with the grass sprinklers!

Me and my hub are at complete logger heads at the mo regarding the marquee I want to buy so we can have the bean's birthday party in the garden. They are so cheap to buy compared to hiring them and we can always plan parties in the garden in the future even if it is raining (it's a bit traumatic to even think of 30 children plus parents and family in the house, and we've had to relocate parties before due to weather conditions.
The marquee will only take up half the garden so parents and rest of familes can socialise in the garden whilst the children have their entertainment in the marquee if it is nice. If it is raining, the children can still be entertained in the marquee, and it would be ok for the parents to come into the house. My hub is concerned about where it will be stored (he is very precious about his shed and garage space) and also about putting it up. I will be happy to put it up with my brothers!!
Am I being unreasonable?