>VFP8. I have a form with parent record data and two grids to display data from child records. I use an SQL select to create cursors for the grids which use the cursors for a record source. When the form opens the grids with the child record data display correctly. However, if I move to a new parent record and at the same time do new SQL select statements using the same cursor name to get new child data for the grids, the grid data and headings disappear and remain missing until I start all over again. What am I doing wrong? TIA.

You should not SELECTing in the same cursor.
First SELECT (In Init event or Load Event of the Form) SELCT .... FROM .... INTO CURSOR YourGridCursor READWRITE

When you want to ReSELECT

SELECT .... FROM .... INTO CURSOR DifferentCursor

thisform.LockScreen = .t.
SELECT YourGridCursor
ZAP
APPEND FROM (DBF("DifferentCursor"))
USE IN SELECT("DifferentCursor")
thisform.LockScreen = .t.

BUT I recomend you to move to CursorAdapters with parameters, Then you just issue:

thisform.CAClassInstance.CursorRefresh()
thisform.Grid1.Refresh()