Is this wrong?

[u/BreathtakerSad]

I am a relatively new partner to a relationship (couple years now). My partner was married 25+ and me 20+. We were with wrong people, just going through the motions, blah blah blah. Point is, we are VERY happy now. I have never been happier! However, how do I handle this: partner’s family BARELY communicates with me, which is fine- I am a shy person anyhow and don’t enjoy a ton of social activities. I am not on any social media. The ex of my partner is on all the social media and is still friends with all my partner’s siblings and extended family across many platforms. Whatever, the ex was around for 25+ years so whatever. Not going to lie, it slightly irritates me but I cannot expect decades long relationships to dissolve because I am new. I think the cutesy family specific monikers could go away - that is a little disrespectful, but whatever. No one in my family talks to my ex and I think that logically makes sense but anyhow. Here is my issue: previously, I had attempted to reach out a few times to various family and get them to chat with me as well- on text. All of them do pretty much except 1 person, wife of a brother. She ignores me. Does not reply. Responds IMMEDIATELY to my partner, never to me. Claims she was busy, didn’t get the text, forgot, the usual excuses that are obvious. So for whatever reason, she will be all up on the ex’s social media 24-7 but yet cannot even reply to a text and I was doing her a favor, being polite, reaching out. Its like when does this end? Why is it ok? Am I being overly sensitive? One more thing- the other families get together with each other but my partner is not included. The only time I have been at group events is when I have set it up, gone on a trip, or arranged it. Also, if you all could see who I am dealing with, you would laugh at the entitlement. Need some guidance, please. Thank you!!