Quoting Aprizzle:" why don't you turn AnnMarie into one word?"
This. Or you hyphenate it into Ann-Marie. I know a woman named Anamarie, so that could possibly be an option as well.
How set are you on the name Adele? You're only using it because your great-grandmother is still alive, right? Are you even really close with her? It just seems like you have important reasons you use the rest of the names, and the reason for Adele is just because someone survived long enough.
What is DH's mom's name? The child should definitely have the same last name as you and DH. It would be a nightmare explaining that every time on school forms, daycare forms, etc.
I really don't like two middle names.
Also, is this going to be your only child? My paternal grandfather's name was Robert (he died when my dad was 19). My dad's middle name is Robert, and he and my mom wanted to use it for their son. Alas, they have 4 daughters. They would have loved for me to use it for DS, but I don't like it as a first name. DS's middle name was kind of set (family tradition to give the first son his father's name as his middle name). We told them that we would use Robert as a middle name on our next son. You don't have to honor every single family member with your first child.