How can I have two Xbox’s playing at the same time with the same accounts on both.

No.as you can only.be.in.one device at a time

You can make his xbox one your home console so.he can use your content on his profile

But on your console.You can use them as long As you sign into.live each time

Keep.in.mind your dad can't use EA play Ubisoft or cloud gaming as those are subscriber perks only

Unfortunately you can not share the same Xbox account on two consoles at the same time. For both of you to play on two different consoles at the same time would require two different accounts. It doesn't cost anything to create an account for Xbox Live.
However, it will cost BOTH accounts to have Gold subscriptions.

I'm trying the same thing. I have two boys who both want to play at the same time. How do I create two profiles that can play at the same time?

You cannot be signed into the same account on both consoles at the same time. But you can share your games on whatever console is set as your Home console.

Realistically this wouldn’t work, it only works if both of you are sharing on xbox using the home xbox feature and having both accounts on the same xbox. If you plan on playing at same time across two seperate devices it wont work with two seperate accounts.
As mentioned it is advised not to use the same account shared to play at the same time