My DPs sister is about to have a C-section. I've been with DP for a number of years and we have his DC 50/50. We are not married and in fact although separated he is still married to DSC mum.
All other family members are either blood or married into the family.
I've bought a card and hand quilted a blanket for baby. Obviously DP will be uncle but would I be auntie even though we're not married? I'm probably overthinking this..