1) If you set up a button in the portal row, it can use Go To Related Records to bring up the records shown in the portal on the child layout and the record clicked in the portal will be the current record on that layout.
2) Enter layout mode while on that layout.
Use the field tool to add a new field to the layout.
This opens the "specify field" dialog.
Select your parent table from the drop down
Select the name field that then appears in the list below the drop down by clicking it.
You have now added the name field from the parent table to your child table and it should display the patient's name as long as the record on the layout is correctly linked to the right parent record.
thanks a lot PMJ, I 'm indebted to you!