Mama Drama, please help!

• 💙12.12.17 👼10.22.19 💖11.17.20

So even before I was pregnant my mom always said she would watch our kids for us since daycare is so expensive. Well our little man is now 16 months and she is really getting on our nerves. She gets mad when we are a few minutes late getting home, we don't think she really plays with him during the day mainly she sits in a chair and watches TV, and makes us feel like it is a burden for her to watch him. My husband is ready to tell her not to watch him anymore. I am at a loss we are going back to the fertility specialist next month but want to sit down with her before we do to make sure she is still OK with the arrangement. My mom gets pissed easily but I need to do something because my husband is pissed I haven't said anything to her yet.