This is AI generated if anyone is wondering.
The PD would have been current nearly 20 years ago and I suppose it may have made sense to move in your early 60's but at 83? Begs the question if your sister is in a position to Sponsor you.
Children I assume are in their 50's? so not something that is relevant to them.
All of which begs the question what did your Sister do when the PD became current all those years ago, she would have a recept from the original filing.