My heart really breaks for you here. It is so hard to control what other people do and especially frustrating when it so deeply concerns the person you love the

My heart really breaks for you here. It is so hard to control what other people do and especially frustrating when it so deeply concerns the person you love the most, your child. What is communication like with you and your child's other parent/s? Are you able to carve out some time to discuss ground rules and shared values, needs and hopes for how your child is raised? I say this knowing absolutely nothing about your relationship with your child's other parent/s, but I would start by building better communication with them around this shared project of raising your child. Ultimately, you are in this together, and if you can find a way to overcome your frustrations and engage in a good dialogue it will benefit your child. I know this might sound very naive, but I am a believer in the power of deep listening and it's ability to heal even the most complex relationships. I know nothing about this person who is co-parenting with you (or it sounds more like parallel parenting:), but perhaps for example, the child is watching lots of TV and eating junk food because your co-parenting feels disorganized and has no idea how to build structure around this, or they're jealous of what a great parent they are and they feel that the only love they have to offer is letting your child indulge in their guilty pleasures. Even if this person is so so difficult, your love for your child can be motivation for opening a productive dialogue, even with the most frustrating human you can imagine. If you're able to bring in a mediator, a professional or a friend, that could also be of support.