While Kupa admitted to striking the children by kicking their bottoms and pinching their ears, he said it was necessary for "disciplinary purposes".
All the children accepted that Kupa hit them to control bad behaviour.
The Crown also alleged that Kupa sexually violated two young females.Kupa has since filed an appeal against his conviction, but not his sentence, with the Court of Appeal.
This was on the grounds that trial counsel made a radical error in failing to apply to sever the trial of the sexual charges from the assault charges.
He also appealed on the ground that the judge erred in failing to exclude prejudical and inadmissible evidence of the physical assaults being heard together with the sexual charges.
His defence lawyer, Lester Cordwell, emphasised that Kupa was acquitted on two counts of unlawful sexual connection, and said neither of the young girls complained about the sexual offending, when they complained about the physical assaults.
In its decision released today, the Court of Appeal said during his trial, Kupa was forced to defend charges of assault on vulnerable children in the same trial in which he was accused of sexually violating two of the same children.
It said the "level of violence prevailing within the household" was relevant evidence to the sex charges.
"We are satisfied that the evidence of Mr Kupa's violence towards all complainants, occurring at or around the time of his sexual offending against the two girls, was directly relevant in this context."
The Court of Appeal also said the judge properly directed the jury about the admissibility of the evidence on two sets of charges.
"We are satisfied that the judge correctly directed the jury to consider only the evidence relevant to each charge when emphasising that Mr Kupa faced separate trials on each.
"We are not satisfied that Mr Kupa's trial miscarried."Kupa's appeal against his conviction was dismissed.
Kupa's appeal against his conviction was dismissed.
