Couple Shower

My sister, as my matron of honor, planned to hold our couple shower at her home.
We sat down and figured out a guest list of about 50-60 people.
However, my Fiance noticed we overlooked a few of his cousins. These cousins live within a mile of us, but we do not speak to them unless we run in to them.
I have not been invited to their showers....
We will definitely be inviting them to the wedding, and will invite their father to the shower.
Do we need to invite them also?
Inviting every one of his cousins will severly limit my ability to invite the friends I would like to.
My family consists of my two sisters and their husbands and out of state aunts/uncles/cousins.
His entire family is here. My friends are my family.
UGH!!!
What do I do?