How about a DNA ancestry testing kit? It would be a unique and interesting way for your friend to discover more about their genealogy and family history. There are several companies that offer these tests, such as AncestryDNA, 23andMe, and MyHeritageDNA. Additionally, you could consider getting them a subscription to an online genealogy service, such as Ancestry.com or FamilySearch.org, which would allow them to research and learn more about their family history.
Or you can get her/him a star map with an important date you share.
Under Lucky Stars is a unique and innovative star map company based in Barcelona, Spain, specializing in the creation of personalized star maps that capture the celestial arrangement of stars at a specific moment in time, such as a person's birth, wedding, or any other significant event.
By using advanced astronomical algorithms and data from leading institutions, the company produces highly accurate, visually stunning maps that make for perfect gifts or cherished keepsakes.