Hi, I have a database with insurance clients and their dependents (spouses and children). We had a problem in the past with the twins and some of them have been entered with one month difference in their dates of birth, some of them have the same dates of births. I need to query both cases. In the case where they are set up with one month difference, the dates of birth has to be within 4 months of each other and excluding the ones that are identical). Here's my table fields: POLICY CLIENT # MEMBER_LAST MEMBER_FIRST DEP_ NAME DEP_DOB POLICY CLIENT# MEMBER_LAST MEMBER_FIRST DEP_NAME DEP_DOB 111111 12345 BROWN SOPHIE LILI 2000/02/01 111111 12345 BROWN SOPHIE ROSA 2000/03/01 111111 12345 BROWN SOPHIE GERRY 2000/04/01 222222 54321 BOUCHARD BEN ANTOINE 1999/05/25 222222 54321 BOUCHARD BEN JULIE 1996/01/21 333333 44555 BAUER JACK KIM 1993/08/05 333333 44555 BAUER JACK ANDREA 1993/08/05 We have both cases here: twins set up with a difference of a month (client # 12345) and twins with same date of bith (client # 44555). We also have another example where the dependents are regular brothers and sisters. Does anyone know how to do this? Thanks!