Non Accompanying

Hi Almost done my application but

I'm just a bit confused with the application to sponser and undertaking and "non acompanying" (4)

I married my spouse so does her family members become having to be listed here ?

I mean she has a huge family; do they really expect me to list every single cousin brother sister, etc on this portion ?

Just doesn't make sense

Forgive my ignorance on that one but I wanna make sure I fill this out ok

Thanks

Thank you :)