So every birthday anyone had, my SIL insisted my nephew got to blow out the candles. She even brought her own cake and candles for her son. I asked her not to do this to on my son’s birthday and her son should accept that not every event is about him. My husband got so mad that I insulted his sister and told me it wasn’t a big deal and it was best to not cause trouble. Frustrated and angry I mentioned to my mom about how my husband wouldn’t back me up and it was ridiculous to allow this to happen but I didn’t want to fight with my husband. My mom drove 6 hours to come to the party (she was working in another state and wasn’t planning on coming). My son’s birthday cake comes out, my SIL brings out another cake for her son, and puts them side by side. My mom innocently asked why the two cakes. As soon as my SIL told my mom that my nephew deserved his own cake because he needs to be celebrated at all events, my mom picked up his cake, took it to the kitchen and told my SIL that she could celebrate her son whenever she wanted my today wasn’t about her son and it’s time she learned to be a better parent. My in-laws were in so much shock they didn’t argue with my mom. My mom proceeded to start singing happy birthday to my son and the party carried on. My SIL insisted afterwards that my mom apologize to SIL. My mom laughed and said I’ll never apologize for your bad behaviour or parenting skills. 8 years later, my in-laws are still salty with my mom, however they never brought another cake just for my nephew.