The two women originally crossed paths as teenagers in 1996 at a gathering for adopted children, forming an immediate connection.

They began jokingly calling each other "sis" in letters before eventually losing touch for 15 years.

The truth was finally uncovered in April when a MyHeritage DNA test yielded a rare 100 percent match, prompting a tearful and emotional reunion in the Netherlands.

Reflecting on the discovery, Geltink described the joy as finding a missing puzzle piece that made her feel at home.

Tijssen remarked, "We were friends before we were sisters. We were sisters the whole time, but we didn't know."