RANT... People are irresponsible!

Okay I need to rant a little bit here. My 5 year old stepdaughter lives with me and her dad full time. Her mom gets her every other Sunday. When she brings her home she almost always leaves her jacket, shoes, or clothes. We never get all of her stuff back. We have the same problems with some of the grandparents too. My fiancé’s mom and my stepdaughters mom’s mom all like to keep her stuff. If we pick her up we have to go inside and gather everything but if she’s brought home we have to go without stuff or make special trips to go get her stuff. We’ve spoken to them about it and asked them to make sure they give her stuff back but they all act like we’re being ridiculous and should just go buy her more stuff... It’s blows my mind. We shouldn’t have to buy her more stuff because you can’t keep up with the stuff we already bought. If we can keep up with a 5 year old and a 10 month olds stuff every day then other people, especially her mom, should be able to keep up with a few things for a day.