My sister has treated me very badly lately… not calling before the surgery, or calling after to ask how I was doing, not acknowledging (forget about thanking me for) presents/cards sent to my nephews, not answering texts, etc. So, I texted her, "When you blow me off, you make me feel like a piece of ****." Her response was lame (she wasn't blowing me off), so I didn't bother to reply. At least I felt better after letting her know how her behavior effected me.

I'm glad that took the time to let your nephew how his lack of responsiveness makes you feel, and he finally wrote you back to let you know that you are loved

I would never share anything about my mental health with her, but think that is the response that I was looking for.