Rick,
I got some info for my step sister in the states.
Human Services Dept. would need the following.
1) Home Study done by state Social Dept.
2) Medical report of husband and wife
3) Police background check
4) Copy marriage license
4) Copy of License for individual who performed home study.

This was for adoption and removal of the child to the US. The procedure is pretty much the same for domestic adoption.....plenty of hoops and
time consuming.

For more info contact Human Services Dept. in Belize City 501-227-7451

Marlas House of Hope in Belmopan, contact Pat Farley 501-822-2689

This may get you in the right direction.
Rod