Sister interfering or being helpful?

Tweet

My son is ill with a high fever. When I took him to the doctor, he tested negative for strep but since the weekend was approaching, the doctor gave me a prescription for an antibiotic so I could fill it if my son became worse. The next day, my son's fever was much, much higher. My sister called and I was telling her that my son's fever was higher & I was going to get his prescription filled after my daughter came home so she could stay at home with him while I got the prescription. My sister told me she would pick up the prescription. I told her thanks but no, I could go get it but if she wanted to do something, I needed to pick up my son's homework at school but had no way to get it unless I left my son home alone, which I wasn't willing to do. She offered to go get the homework AND the prescription. Again, I told her I could get the prescription and I thanked her for offering but didn't want to burden her. She insisted that she get both and insisted she would be on her way to my house shortly to pick up the prescription and take it to the pharmacy. She got my son's homework and his prescription for me and I thanked her and I repaid her for the prescription. I had given her my debit card to use to pay for the prescription but she had paid cash instead, so I gave her the cash. Later that afternoon, my mom calls and tells me that my sister had called her and told her my son was sick and that she had gotten his homework and his prescription. My mom told me to call her if I needed anything and I thanked her. I didn't call my mom because my sister and I have both been having issues with our parents and our other sister. I have been doing my best to keep my distance to avoid any further conflict and my sister knows this. I don't understand why she would call our mom and tell her everything she was doing for me. I feel as though she called our mom to complain, but I don't know if this was the case or not so I am trying to keep an open mind. An acquaintance of ours fell ill and while talking to my sister about it, I mentioned that I would get this person a bag of their favorite chocolates. I did pick up a bag, thinking I'd take it to them today. This morning my sister calls me to tell me she picked up 2 bags "for me" and gave them to the person. I told her oh no, I'd already bought them a bag (they're not cheap) and told her I would pay her back. Her reply was that I didn't have to, it wasn't a big deal especially since I'd gotten a bag already. I mentioned not being able to get it to them until tomorrow and she told me I could just eat the bag of chocolates that I had bought. Just left wondering if she was being thoughtful or if she felt insecure because she didn't know the brand I mentioned was this person's favorites and she considers herself to be a much closer acquaintance than I. Personally, I feel she should not have called our mom about my son being sick. If I want our mom to know, I will tell her myself. And if she wanted to be kind and pick up chocolates for me to give to a friend, she should have texted or called me to ask first. Do you have siblings who interfere like this? I am hoping that my sister was only trying to be helpful but I don't understand why she would call my mom about my son when she does her best to keep her distance from our parents. It strikes me as odd that someone who won't visit our parents or call them more often decided out of the blue to phone them with news of my son. I feel if she wanted to call them to talk, she can call them and talk about her own family and not mine.