They're a bit young and first time parents... meaning they've got a few things against them when it comes to raising babies.
The dad is a cinnamon opaline. Opaline is frequently called yellowsided in green cheeks. Both cinnamon and opaline are sex-linked genes. In short, it acts recessive in males and dominant in females. Females can only have one gene, and they get that from their father. If father is visual, then any offspring that look like him are automatically females as long as the mother is NOT the same mutation.
If the mother is a pineapple, dad normal, then all offspring would be normals with males being split pineapple.
If mom is a pineapple and dad is split pineapple, then it's possible to get normals and pineapples (and/or cinnamons and yellowsides) of both sexes.