Diamond anniversary sentiment--could be for 50th also if adapted
Traditional and Modern Anniversary Gifts by Year - http://www.memorablegifts.com/gifts/pc/Anniversary-Gifts-c51.htm
Love this idea for an anniversary gift. So unique and pretty.
40th wedding anniversary for mom and dad
Wedding Anniversary list
Times by 10 for nan and grandads anniversary for their gift for the 50 year anniversary!
50th anniversary party ideas on a budget | 50th Anniversary Table Decorations | My Grandparents 50th Wedding ...
We Still Do Banner We Still Do Sign by WeddingBannerLove on Etsy
Idk where this could fit into your story but it's interesting...
50th Anniversary-- Like the idea of a family tree with pics of kids and grandkids. Use a pretty container for base and leafless tree limbs, gold ribbons.