sql problem in Access

I've spent already three hours on this problem and didn't get any progress yet.
Because I am only a rookie, I guess most people here know a solution.

The problem is as follows:
There are two tables both having instances that reference to the person table by referring to the primary key personID.
Now I wants to count the number of references to each person.

From one single table is no problem:
SELECT [Person].[personSurname], COUNT(*)
FROM Person, Table1
WHERE [Person].[personID]=[Table1].[table1PlayerID]
GROUP BY [Person].[personSurname];

But how do I get it work for two tables?
I tried this:

(SELECT [Person].[personSurname], COUNT(*)
FROM Person, Table1
WHERE [Person].[personID]=[Table1].[table1PlayerID]
GROUP BY [Person].[personSurname])
UNION (
SELECT [Person].[personSurname], COUNT(*)
FROM Person, Table2
WHERE [Person].[personID]=[Table2].[table2PlayerID]
GROUP BY [Person].[personSurname]);

But then I get for each person the number of references from both tables.
What I need is an additional ´Group By´ at the end of the query, but how can I implement this?
Thanks in advance!

The easiest way is to write a simple union query. Then write another query based on the union query with the grouping.