Lookup Value Based On 2 Fields

I have been working with a simple Dlookup to return a value based on the data held in a specific field. I am now trying to develop this further and need some help.

I have a query "QryMainForm" that brings together fields from 2 tables "TblFS" (fields: Ref, score 1, score 2) and "TblFamily" (fields: Familyname). the query adds the values in Score 1 and Score 2 and saves the value as "points".

Seperatly from this i have a table "Tbllevels" which contains the fields Score, Operational, Admin, Technical. with the points scored relating to a value within each field. What i need to do is run the lookup based on the both "points" and Familyname fields contained in the query.

So the TblLevels looks like this:

Score.....Technical.....Operational.......Admin
100........................... Level 1.........Level 2
200 ........Level 1..........Level 2.........Level 3
300.........Level 2..........Level 3
400.........Level 3

So someone who scores 300 points could be assigned to the technical or operational group (this is done manually). What i need the lookup to do is to return the level based on the points and Familyname fields located on "qrymainform"

any ideas on how i can do this one?