My self and dp have one dc together (baby) I have 2 older dd's from first marriage and he has a son from his first marriage!
Now 2 things have annoyed me on last few days!
Firstly he went out with his son at weekend and went to card shop for his son to get cards for DP's bro and wife and his mum (so uncle, nan etc) and got his son to write these and told me how his son had written special cards to them, when I asked if he had picked up cards for the other children to give he actually looked shocked and said why would I....... Ummm because for a start our baby is related to them the same way as your son is!
Second thing that bugged me was when wrapping presents for his family I asked him to write tags, he wrote the tags from him, me, his son and our baby! No mention of my other two children, when I pulled him up on this he then added "the girls" at the bottom, AIBU expecting him to at least write there names and include them as part of the family?