An 8-year-old boy who spent almost half of his life in foster care was finally adopted last week in a ceremony that had over 300 people come. When Nike Schwartz was four, he arrived at the Schwartz household as a foster child. He had already spent nine months in the foster care system before he would arrive at his future forever home. Kristi Schwartz and her husband David Schwartz have a 17-year-old biological daughter and a 10-year-old daughter they adopted a year before Nike came to their house.

"We got a call asking to take him in and we said yes and he showed up at our door at midnight on May 4, 2016," Kristi told Good Morning America. "You see these kids in their most rawest form and you just feel this maternal instinct to want to provide that stability for them."

The couple had not planned on fostering more kids until they were contacted about Nike. They were told at the time that his family placement options had been exhausted and the next home he was placed in would need to be an adoptive home, according to Schwartz.

RELATED: Sesame Street Welcomes Newest Muppet Who's In Foster Care

Nike's biological parents' rights were terminated in 2017, but his adoption would take two more years to happen because his biological family kept making legal appeals. However late last year, the Schwartz family found out that Nike's adoption would go through on Feb. 17.

"I saw this sense of relief that it was finally happening," Schwartz said. "We talked about it so much and the timing of it was out of our control so he couldn’t believe that it was finally happening."

To celebrate the end of four years in foster care, the Schwartzes wanted to make Nike's adoption day extra special. They made t-shirts that said "May the Schwartz be with you" and featured Nike's adoption date, 2-17-20. The family also invited 300 of their own family members, friends and adoption officials who have been with them throughout the journey.

Also in the audience was Batman, and more than two dozen of Nike's second-grade classmates and his older sister's high school drill team, who cheered Nike on with pompoms.

 Schwartz acknowledged that her family's own transition with Nike "took a little bit" of time as he adapted to their family's stability and reached new developmental milestones. Now the family can't imagine their lives without each other.

"He has just turned into this kid who is so easygoing and such a positive little force," said Schwartz. "He has a ton of friends. Everybody loves him. He’s just a great kid."

READ NEXT: 20 Facts On Foster Care That Most People Aren't Aware Of