I’m also trying to get information on my grand father (rank?, branch, dress items etc).

I appreciate it’s difficult to say much from pictures but I’m still learning so I’m glad of any help.

Please correct me if I’m wrong, this is what I’ve gathered so far. The breast eagle is that of a luftwaffenhelfer (which should be blue in colour). The district triangle looks to be Nord Niedersachsen, in white rather than gold? (I’m not sure of the significance of this)
I think it is early or pre war? I’m not sure of any details on the cloth and shoulder boards, DJ rather than HJ?
I’m not sure what cap he’s wearing in the second pic, HJ or luftwaffer