Stepmoms feeling second rate?!

Leticia
First off when I introduce J, I always say this is my son J. He lives with his father and I, with our 2yo daughter and I'm 35 wks pregnant with our son. I'm a SAHM so I literally do everything for my kids, including getting J up for school, attending all school functions, signing papers, making and taking him to all DR appts, helping with homework and getting ready for bed. I feel like I'm a good mom so I'm not posting looking for validation. I'm mad that J's mother overlooks everything I do for him. She asked my husband to bring J to see her today, since he lives with us he only sees her on her days of from work if it fits into his school schedule. Hubby has to work so he told her I would do it later, when I go to a bday party. What makes me mad is hubby didn't even think it was an option that J goes to this party with me, and neither did mom, they both just took him away from me for the evening and I had no choice. Then when she gets here to pick him up (because she didn't want me bringing him) I give her all the meds he's supposed to take for the next two days and hubby tells me she was mad when I was telling her what to do. I'm sorry that I took him to the Dr and so I know what they said?! As she was walking out the door she tells hubby she needs to enroll J in school where she lives (next town over) as if he's going to live with her next year, after living with us for the last 4 years. And hubby is going to give in because he doesn't want to fight about it. Ughh I'm just upset and have no real reason for posting lol any other moms or dads want to vent with me???