Cookies For My Kids?

Will someone bake my kids some cookies or something? I feel so bad for them. My mom called me tonight to ask me if it's okay if they play at the park while the 10 year old from next door watches them there. I said "No, it's almost dark and a 10 year old is not old enough to watch a 7 years old and a 4 year old." So then my mom, while on the phone with me, goes screaming to my children who were apparently already playing at the park with the 10 year old. She tells them "Mommy says you can't play at the park, you have to come home!" What!? They can play at the park, if my mom will stay there and watch them. I didn't say they can't play at the park, I said a 10 year old isn't old enough to watch them without an adult. That's what she called and asked me. What the hell is she making me look like a jerk for? So the kids start complaining and she starts arguing with them and they start crying. Then she hands the phone to my 7 year old who then screams and cries begging and pleading and asking why she can't play at the park and she's getting so loud I can't even make out one word she's saying. Finally I snap at her and start yelling at her for crying about it and and get stern and tell her she's just not going to play at the park right now unless Grandma will stay there with them. To which she asks Grandma, who yells at her again about how she doesn't feel like doing that. So she cries more, sounding totally heartbroken. Then I hear my mom telling her she needs to do her homework. Hmm, that could have come up a lot earlier. So my mom takes the phone back and tells the kids to go to their room for a while. Now I feel really bad for them. I'm on the verge of tears because I just had to yell at my daughter who I've seen ONCE in the last week and now my kids are sad and think I'm mean and my mother just totally made me look like an ass. So then she starts to complain about the kids arguing and fighting and crying. So I lost it, I started crying. I sort of yelled at my mom "You shouldn't have already had them at the park and then call me and ask if it's okay. Now my kids are upset and mad at me and I have to worry about how I just yelled at my daughter who thinks I'm so mean now.." So she cuts me off and starts "apologizing" which comes out like this: "I'm sorry. I try. I just can't do anything right. I don't know how to handle anything. I'm trying to take care of your kids for you. I just don't know what to do." Sometimes I wonder how I ever survived my own childhood. I just don't get it. So then, I think maybe having yelled at her she got the point, that what she is doing is wrong. That she's putting a stressful wedge between me and my kids and making them feel bad and making me feel bad. Right? NO! She turns to my kids and tells them "You've got your mommy all upset, and now she thinks you're mad at her." So of course this makes my daughters more upset, and me too. Then she tells my 7 year old to tell me she's not mad at me. WTF! So my little girls gets on the phone crying telling me she isn't mad at me. Oh my goodness. Will the drama ever stop? Talk about emotional abuse from every angle. And I can't talk to my husband because he confronts my mom and then my mom confronts me and it's this irritating vicious circle that does nothing but frustrate me more.