In laws visiting after baby comes

After My last pregnancy i had some very bad post partum depression and my inlaws want to come up and stay with us 3 ish weeks after my son is born i dont want them there i want them to wait but neither them nor my husband understand that i need the time after hes born i am so stressed out it isnt even funny they want me to host them for a week maybe 2 and my daughters birthday party all within a month of his birth i dont know what to do my husband is upset that i allow my mom to be at my house and not his parents the thing is my mom doesnt stay with us and shes helpful