No one bothers to take pictures of me with my Husband and Stepson. And I take pictures of everyone with my SS.

So this is becoming a regular occurrence and I'm starting to feel some type of way about it... My husband and I have been together for 4 years .. we have known each other since before he had his son, I frequented his family's home and get along with them relatively well to the point where they themselves have commented on the fact they get along better with me than they did with his son's mom. When he got into a relationship with his son's mom I gave them space to have their relationship and when she fell pregnant and had their son, I gave them even more space. So for his first two years I barely spoke to my husband or his family. But their relationship didn't work out, and shortly after he ended things with her (6/7 months) she got married. We only got married after 2 years after we started dating. I spent as much time as I could building a relationship with my SS from the beginning (he was 3 when his father and I started dating) and id like to think we have a positive relationship. My husband and his family are very close knit. I come from a somewhat broken family so most of my time is spent with his. I love them to bits and I love my SS. I really felt more connected after we got married. I struggled a lot with feeling out of place and excluded from the normalcy of a biological family dynamic. But I kept it to myself and processed it internally. Every time I was excluded from pictures, decisions, discussions, plans, the years I was not in the picture.... it was extremely difficult to work through. The road with his mother was also very rocky, but she seems to be getting used to the idea of our relationship and dynamics now. I'm now pregnant with my first biological child. I'm excited but also scared of the dynamic change even though the age gap between baby and SS will be 6 years. Since I come from a blended family, I know how complex the feelings and dynamics can become. I'm tiptoeing around this entire situation with care. We have finally told our son and he is extremely excited. But recently I was thrown a bit by a small and seemingly insignificant instant that threw up old feelings of exclusion for me. My SS graduated from playschool and I was very excited and proud for him and for his parents. His mom was kind enough to invite us to join and watch the ceremony. It was the first time she has ever involved me in an invitation. We went, my husband's family joined and the night was a huge success. Since we brought a camera, I offered to take pictures of everyone. I even offered to take a picture of my husband with my SS and his mom.

But no one, no one took a single picture of me and my SS or the three of us.

I'm gutted. And normally I would not be upset by something like this but, when does it become natural for people to include a stepparent? Do I really need to ask everytime? I'm about to have a baby and I'm wondering if this child will experience the same exclusion just because they were not the first or part of the original family? It's so simple, but it really ripped my heart in two.