Ok, I realized that pin 4 on the PIC is the MCLR pin, which is only capable of acting as an INPUT. It is not bi-directional.
The DS18b20 temp sensor and the DS2417 RTC are going to have to share pin 3 (PortA.3)

so now my code will have to at least take into account the family code 28h vs 27h when communicting with the two OneWire devices.

PS
Sorry about the photo size (I think it's a bit too big)