Grandparent

We just, not even a week ago, lost my FIL. For my daughters’ entire lives, he lived 10 minutes away & was a part of all their celebrations. He took them fishing, attended all their talent shows , & was a very visible proud grandpa. But my husband’s really reeling. His father still lived in the house DH was born in, so all the memories are fresh & sharp. But my question is, to those who have gone through it, how do you express your own grief while supporting your spouse? My grief can’t even be in the same class as his, yet I loved his dad too. He was my FIL but acted like my father-in-fact.