I married 2 years ago and I can give you one VERY good piece of advice:
Do what YOU 2 think is right and ONLY that! Screw what the rest of the family thinks, if they don't like it they can stay away.
This is YOUR big day and you should remember this as the perfect day, just as you dreamed it. So DON'T listen to suggestions for guest lists or the such - invite who YOU want to share the most beautiful day of your life!
And congratulations - getting married is awesome
(Remember to walk slowly down the isle to really feel the guests stare at your beauty - grrrreat feeling!)