Hi fellow mums!

Are anyone experiencing favoritism of in-laws among their grandchildren? Unfortunately, my children are not the favorite ones and somehow they are the victims of favoritism. For instance, their grandparents would say nasty things about them but their all praises for their other grandchildren. Or there are times where they would buy new toys for their other grandchildren but give old used toys to my children. How do I deal with it? It really pains me to see what my children are experiencing at a very young age.