I'm having this problem. I correct my MIL on the way she is handling my LO but she does not want to listen. Things like letting my LO stand up while in a moving car. This is very dangerous and she don't get it. Anyone encounter the same problem?

Same here. And worse my mil will pretend she understands and listen but she will do the exact opposite! Tell your husband to talk to her? It will be easier to get through to her. For some reason I feel mil like to show that they are more capable than us in taking care of babies So us telling them not to do something they will not listen.