As many of you know my Dad passed away on Easter. Yesterday I designed my invitations and I googled how to word the invite. I was brought to The Knot site where it stated not to include my Dad's name as he wasn't hosting. It seemed wrong to me but I wasn't sure so I made a mockup & read it to my mom, she burst into tears. I immediately did more searching until I found an appropriate wording including my Dad. Do not listen to "etiquette" that will hurt your family. Trust me, I wish I had followed my gut & not even brought that up to my mom, luckily we hadn't ordered them yet & I'm so glad my Dad is listed on my invitation.
Edit : I wanted to add in case someone doesn't read through the comments that the real advice is to listen to your heart, do what makes you feel comfortable with, & don't always follow etiquette just because it exists!