After plunging and snaking the toilet, sink and tub; my toilet and sink still drain into the tub after I flush or run the water in the sink or tub.

I also checked the trap outside. I do not know what else to do? Thanks for any help!

You have a blockage in the bathroom drain line that has to be snaked out.
You can do this one of two ways. 1) from the lavatory roof vent, bput out enough cable to reach the base and 20 feet more,**or** 2) pull the toilet and snake from the open closet bend. Good luck, Tom