The man assaulted his grade 7 daughter which resulted in the birth of a child, police say.
He was arrested and charged with two counts of incest and sexual penetration of a minor.
In a similar incident, a 69 year old man was also arrested for sexually assaulting his 10 year old grand daughter.
Both cases are undergoing Committal Court process at the Lorengau District Court.
Manus PPC Chief Inspector David Yapu is concern of such sexual abuse of girls by family members.