Lastly, this statement is of concern:
Grandkids whole life
Never, ever leave the pics on the card that long. SD cards, while stable, are not as stable as your pc. Far too easy to accidentally delete, or the card goes bad, gets lost, or any of a number of other things.
Just looking at all the questions in this forum, the vast majority are something to do with the SD card. How to get back accidentally deleted/formatted pics, or from a now broken card...
On a regular basis, d/l to the PC, create a backup in another location, and then wipe the card.