Do I have a right to be annoyed by this?

[ke]

My stepdad who has lived with us since I was 4 and apparently thinks of me as 'his own' put a photo on his twitter of my mum and put the caption 'the greatest lady i know (as well as Imogen)' Imogen is my stepdad and mums daughter. Its like I completely understand why he would have more love for her etc. but it's like don't say you think of me as your own when you clearly do not.

I have been off with him since I saw him but cannot say anything about it, the first reason being i'm not allowed twitter, and the second that it will cause a lot of rubbish
@Mackenzie hugo, i dont understand the issue