<human>: Can you provide a brief overview of the text?

My girlfriend and I have been together for only about 3 months. Up until recently we would spend most of the week together with her basically living at my home. Over the weekend she advised me her 26 year old brother had left her a 3 page hand written note asking her to be home more often (they share a home owned by their father). I haven't gotten the details but basically she said it was an emotional letter which brought her to tears and that she would need to spend more of her time at home. Considering that they both work nights and she has a tendency to sleep most of the day (she works as a server in a restaurant) I don't really think they spent much time together before she met me.

I'm having a hard time understanding why a 26 year old man would need or even want their 21 year old sister to be home most evenings. I have yet to meet him and I suspect he doesn't approve of our relationship due to the age gap and that he is simply manipulating her emotionally in order to keep us apart.

Does this strike anyone else as odd? Could this be an excuse that she is using to put some distance between her and I? Has anyone else ever been in a similar situation? I don't want to make too big of a deal of this because obviously her family is an important aspect of her life and I respect that, especially given the short time frame of which we have been in a relationship together.
<bot>: GF's big bro complains shes not home enough and is emotionally hurt by her spending most of the week away from home.