Don't make it morbid then? Just talk to them and let them get to know who you are.

That itself is incredibly difficult as most people can't describe who they are beyond their name and title.

The biggest thing people who have lost someone close to them have to say is that they start to forget what the person looked like and sounded like. I am doing it - I think if you keep it casual, like "hey, I was just thinking about you and the day you graduate high school, and I'll bet....." kind of thing, you're making it less morbid.

There's an old episode of RadioLab or This American Life (I can't remember which) that explores this very topic. If memory serves, there was a woman who lost her mum at an early age but her mum recorded videos to be shared with her at certain points in her life (birthdays, graduations, etc). I recall her mentioning she came to dread those events knowing she would have to relive losing her mum by watching the video. I can't recall if she felt it was a net positive or not.

My mother passed away from lung cancer about 2 years ago.

I wish I had more videos and audio recordings of her. I wish I had handwritten letters from her. I wish I had audio/video of stories and family history only she would know. Above all, I don’t think I would have found any of the above weird or morbid, and I doubt your children (or spouse?) will either. I know my siblings feel the same as I do. You should feel safe in knowing that they will deeply appreciate any artifacts you leave behind for them to think about when they miss you.

I’m sorry for what you’re going through, and I wish you and your family the best.

I have located different bits of old media recorded of my grandfathers on both sides. One example being a long form interview about my maternal grandfather’s Korean War experiences. I enjoy watching or listening to these from time to time. If my father passed early I am sure I would’ve been very grateful to hear his words too.