Text Message Randomly Not Delivered to iPhone

I have both an iPhone XS and an iPad Air 2, and both are set up to receive text messages. Both my wife and brother have iPhones and once in a while, I will receive a text from one of them on my iPad but not on my iPhone. This is purely random. It has happened a couple times with my wife and once with my brother. Both my iPhone and my iPad are set to receive iMessages to and reply from both my phone number and my Apple ID.

I would like to turn off messages on my iPad but now I am afraid I will miss a message because the messages that fail to deliver to my iPhone do get delivered to my iPad.

Any suggestions on how to fix this issue or an insight as to what is causing this issue will be greatly appreciated. Thank you.