Delte From 3 Table In One Procedure

HI

I have 3 table
in table 1 i have a ID i use in table 2 and in table 2 i have a ID i use en table 3

In table one i have a datetime field


What i want is to delete all from this 3 table when the datetime value are more than one hour old.

I can delete old from the table one by:
delete from tableName
where datettimeField < dateadd(hour, -1, getdate())

But how do i delete all the records from table 2 and table 3 off course where the ID in table one are the same as in table 2 and the ID in table 2 are the same as in table3

Hope someone can help

LN