Are developmental, familial and congenital anomalies different?

Not really. Developmental = failure to meet developmental milestones such as sitting up, walking etc. This may be aquired from e.g. Birth injury. Familial means that it is a trait within a family, presumably genetic. Congenital is "accidental" with no known cause.

Related Questions

Are developmental and congenital anomalies different or the same?

Different. Congenital anomalies are present at birth. Developmental anomalies develop over time. Read more...
Probably different. Congenital anomalies are typically genetically-determined anatomical defects as part of a syndrome or isolated accidental anatomical problems. Developmental anomalies have to do with acquired problems of neurobehavioral nature, typically. Read more...