Yes I recognise this. My parents did their best but just found my brother much more relatable. I was always a bit of an outsider, late diagnosed ADHD, he was sporty and quite popular. We weren't treated differently in a material sense but it was made very clear that I wasn't what they had wanted and didn't meet the brief and he did.
My mum I think it came from low self esteem. She'd moved to a much more middle class village than where she was brought up and felt like an outsider, I think she had hoped the kids would make her fit in more (which DB did, going to cricket club etc) and I didn't, preferring my own company.
My dad just didn't seem to want children at all, apart from enjoying having a bit of a mini me to do activities with. There was a fair bit of walking on eggshells, being told to shut up, called stupid, pathetic etc, having my physicality and personality criticised in quite a fatalistic way.
DB wasn't showered in praise all the time but he wasn't made to feel he simply wasn't right. He was bullying when we did activities together and nothing was done about it. I am quite close to him now but it is a bit sad to see him still enjoying things he made clear I was shit at and had no place taking part in.
Not narcissists just not very flexible in what they saw as a 'good' child with value. Tbh I think they both have slightly limited social skills and felt embarrassed by me not making up for those by being a perfect golden all rounder.
I still have a tendency to blame myself for absolutely anything and everything but learned a lot about how to accept people for who they are and not how people may judge you by association.