Make Friday a day he'll remember. Wear something he likes(not to obvious), do something with the kids and create a moment everyone will cherish. It does not have to be any "big" activity, just something you will all enjoy sharing the love in the moment.
Sounds like a lot of pressure, might be. Lose yourself in your family and enjoy the ride. Do not pursue him, let the day evolve organically. I hope your family is showered in a day of love.
