from gm friends and family site --
Who is eligible for the GM Employee Discount?
Eligible participants in the GM New Vehicle Purchase Program can share their discounts with any of these eligible family members:
Spouse
Children
Stepchildren
Grandchildren
Stepgrandchildren
Same Sex Domestic Partner (Where applicable. Please check with the National Benefits Center at 1-800-489-4646 for eligibility.)
Parents
Stepparents
Siblings (including full, half and step)
Mother-/father-in-law
Sons-/daughters-in-law
Brothers-/sisters-in-law
