Mitchell and Cameron adopted a child from Vietnam. This is legally impossible as Vietnam's laws forbid a child to be adopted by single parents or same sex couples. They could still adopt the child illegally but then it would be impossible to bring it back to the States. While this is likely true, it was also likely done for legal reasons. If they announced the baby to be from somewhere else, people make claims that they have stolen their story, all in an effort to grab some fast cash.
Baby Joe breaks an expensive bowl that belongs to Mitch and Cam. It later appears in their living room on the bookshelf.