End of life/ work

My husband’s grandfather is dying and we’ve been told to make the trip to go say our goodbyes.

My husband was really close to him and is upset. I’m going to call my boss and let her know I need 3 days off work this week for the trip as we’re hoping to spend some time with him and it’s very touch and go.

I feel anxious about this though? Maybe because it’s not my direct family member. But I was also fairly close to the grandparent and obviously want to show up for him and the family.

From a managers/ work perspective do you think my request is silly? Or standard? And I’m just overthinking?