From the scene I saw, it seemed to me that Griss' parents were still together when his father died...[Grissom]"It was a hot day, my mother went to get him a drink.."
And in relation to Griss' bio about his parents' divorcing when he was 5 - [if the bio is from CBS.com] you need to take it w/ a grain of salt because there are inconsistencies, i.e. Sara being an only child but in "One Hit Wonder" she tells a story of involving her brother.