Ive lived over 70 miles away from most of my kids for the last 11 years, they are all busy with their own lives& families and we keep in touch by phone when we can, but two are keyworkers and have had very little free time so the phone calls have been infrequent, but still when we eventually do can chat over an hour (both son and daughter) and when we are ever together (not since before lockdown) we enjoy each others company immensely, and i dont doubt they love me and know that i love them in return.Same for my other kids.And grandkids. I think we are all overthinking things during this enforced separation weve had- it gives us more time to ponder- but i doubt your son is sat doing the same.He sounds very busy and outgoing indeed, i also wonder if your daughter has a good relationship with him now hes older? I think maybe hes outgrown his resentments but as you dont live near him, youve not seen that? If not then you should maybe spend time helping him to forge a better relationship with his sister as they will need each other later, when you are no longer here.You can also write a letter for each of them for when that time comes. And your gc. But in meantime, if you can ,go see him, when you can, and tell both your children you love them, whenever you feel you want to.