Husband keeping children away from his father

My question is pertaining to relationship of my children with their grand father (husbands father).

My in laws are divorced now for a very lone time. With the result that there is no communication between my husband and father in law at all. Since being married and having kids now I would like my children to have a relationship with their grand father (Dada) as my father (Nana) is late. I have posed the question to my husband regarding this and he said that his father is aware of his grandchildren but has not made contact. But my feeling is that his father has not made any contact because father and son are not on talking terms and as result he has kept his distance.

Should I leave it and not pursue this any further or shall I try and make contact with my father in law even though he does not know me. What is the correct action to be done here. Please advise.