I can tell you flat out, even if you do buy your other daughter new toys, they will still squabble! We had this same problem occur on Christmas day when my older boys were small. There were presents all over the floor, new toys, new books, new slippers that barked like a dog. No matter what, one kid always seemed to want what the other had, yet, that kid refused to let it go because of the hard and fast “MINE!” rule of toddlers. On that day a decree came from on high, yes, mommy made a new rule! New toys are the sole property of the recipient for 24 hours. In that first 24 hours they can play and not have to share it with anyone. If they do share it, and suddenly want it back, they get it back immediately. However, after 24 hours the toy becomes property of the house and must be shared following the usual house rules. Exceptions are made for loveys and blankets and bedtime toys that are special to the owner. As the kids have gotten older, exceptions have also been made for very expensive items, like the Lego robot kit, or the fancy pocket game system. Those have their own special protected category. Overseen by a parent, the younger kids can play, but otherwise they are only for the older kids to use. The rule, made up in the heat of a screaming toddler war, has lasted us almost 10 years now!