Speaking as an older brother and an elder cousin my stories kind of opposite. I like holding kids and sometimes I babysit my younger sister and can even make a bottle for her but I get the feeling that the 3 year old hates me. I swear she is attached to Dad like an iron bar and a magnet but wouldn't even come near me for some reason that leaves me scratching my head. It gets frustrating since she acts like a head honcho of the house getting everything she can get her hands on including my school books, computer, band uniform, etc. She is also a crybaby 90% of the time and it's either her way or the highway.
Now, my 3rd baby cousin, she is utterly adorable and great. She turned 1 this year and she practically loves me. No matter how long I haven't seen her she would still come to me and lets me hold her and stuff. She is highy spirited like her older brothers but has this academic look about her, like she is someone that just walked out Oxford University.