Don’t make this so complicated. “For Jane Does in loving memory of John Doe, 1-1-1 to 2-2-2. Made by request of his daughters by Aunt Betty.” You ARE a part of their family - your children are their cousins which makes you their Aunt, ex or not. Use “Aunt First Name” - that will make it clear who made it for fututre generations who won’t care about the family drama that has passed.