I feel the same about my dad. We have always been close, but more so since my mum died.
He is up there at the top with DH and my children, couldnt imagine life without him, and hate it when he goes away for 2 weeks every summer!!!
So no, not unreasonable, but I would concentrate on your relationship with DP, I love my DH to bits, he understands my relationship with my dad, and we are a united front with the children.