Here is the setting:

Table1 is related into Table2.
Table2 is related into several child tables.
Forms' parent grid uses Table2 as recordsource.

If I programmatically change the recordsource of the parent grid to Table1, the childgrids go dead (they no longer updates their contents as I move from record to record in the parent grid). All relations are intact after doing this, so why doesn't the childgrids follow the childtables any more?