Am I wrong??

Rachel
I have 50/50 custody with my ex for our 5 year old son. His preschool year officially ended and now their "summer" starts, which is $350/month for each family is.. well I am a stay at home mom and my sons two kids will be home with me during their summer...is it wrong I want my baby home with me rather than sending him to daycare for the summer until kindergarten starts his fall? It's silly to me to spend $350/month when they just play, watch movies and hang out...when I am at home with the other 2 kids, plus he isn't going to be happy going and not being with his siblings. 
On top of it, I am 20 weeks pregnant and we could def save the money right now! 
His dad is fighting me on this...mostly because he doesn't want him to stay home with me. He hates it because "I don't work or do anything." I am lucky enough where I don't have to work! Not my fault my husband does well and supports us😑