I am in sort of a similar situation, I guess I see my FIL's at least 2 times a year, maybe 3 or 4 if they make visits out to Toronto. One thing I did, was keep in touch via email with my FMIL. She has told me she really appreciates keeping up to date on our lives as my FI is TERRIBLE at doing that. He calls her about once every 3 or 4 weeks! And rarely emails. He loves her to death but is just busy and isn't really the Share-y type with his mom.
So her and I have developed this email relationship, she updates me on what is going on in Calgary, and I tell her about new wedding stuff, sent her photos of the dresses I was considering, she has 3 boys, so I think she is excited about having a daughter!