Steve, my prayers are with you all too. There's been some great advice here. Make memories, do mundane things together, take videos of him telling family stories, get your genealogy questions answered, treat him to special trips for his bucket list, document it all.
My father passed away in Dec 2007. From the time I was maybe 5 years old until 20 years later when I was 25 years old we had no contact. He'd been forced out of our lives by my mom's mother, and he went on to make a new life for himself halfway across the country. But when his second wife left him, we got in contact and tried to develop a relationship. In 1986 I was able to get a 6 week "externship" as a medical student where I could go to UCSF and work with the doctors there, and stay with my dad for the first time in almost 20 years.
For the next 20 years we got to know each other, but he lived in CA and I was in Texas and then Colorado, and we didn't get to see him much, except for a short stint where he came back to Texas and dated my mom again for about 6 months before he moved back to CA and before I moved to CO. We talked on the phone a lot, and at the end of the calls I would tell him "I love you", and he would say, "I know", or "Thanks". But about 2-3 years before he passed he would respond, "I love you too". He'd been hurt enough over the years to be wary about opening up his heart.
During that time I witnessed to him about my becoming a Jew for Jesus, and he put up with me while my mom, stepdad, and brother became believers. I suspect that my dad did too, but he couldn't say anything because of the rest of his family in CA. We flew him out to Colorado in 1992 for our wedding, and again in 2005 when we moved into a new house that summer and his granddaughter had a birthday. Between his visits to CO we took a trip to CA around and took him to Monterey to visit the aquarium and whale watch.
On his 3rd visit to Colorado in 2006 we did more things that he loved, like took a train ride through the Royal Gorge Railroad, and went out in a speed boat on Pueblo reservoir, and played with my kids. At the start of that trip he tried to die after climbing the stairs to go to bed the first night he was here, due to dehydration during the plane ride and his Afib going out of control. I had to do CPR to bring him back, and after 2 days in the hospital he was released so that we could do the boat ride and train ride. By the next year he was gone. He wanted his ashes spread on his favorite train tracks in CA (big train buff, none bigger than him), and I lost the address where his ashes were spread.
We made great memories together, even after being separated for 2 decades when I was growing up. But, I only have a couple of pictures of him with my family, and no videos - in 2006 when I last saw him, my smart phone was a Palm Treo or Kyocera 7135 Palm OS phone with crappy camera, and we'd forget the Kodak or Sony camera all the time. We had a digital HD camcorder that has long since died, and are not even sure where the tapes are or whether we have videos of him on the tapes.
So, make memories and take videos, spoil him and tell him that you love him, and if you are a believer then share the Word with him as well.
On the Royal Gorge Train during his July 2006 visit, on my middle daughter's birthday in fact.
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