hi,
i lost my dad in 2001 and have had many dreams with him since then....
just wanted to suggest that maybe if you go spend some time at his house, it would help to open up the channels....
i know for me, being at my dad's old house (my sister lives there now) really brings his energy up.
i agree with shelly about doing things that you used to do with him, even the most mundane activity will help. for example when i clean my house, i feel my dad inspecting my work and admiring it. its cool.
best,
august