My husband and I use the same apple id. I get his and my phone calls. Help?

It is not recommended to use the same Apple ID for iCloud. That is where the issue is coming from when on the same Wi-Fi network, such as at home. You can use the same Apple ID for iTunes and App Store, but should use a different one for iCloud. However, another method to fix this is to go to Settings>FaceTime>iPhone Cellular Calls>OFF. You can do that on both devices. I would however, consider getting a different iCloud account for one of the devices.

You're welcome.