Objective: The aim of the current study is to investigate the feasibility and effectiveness of the blended care pirate group. Study population: Children with unilateral cerebral palsy between 2.5 and 8 years old will participate. These children will participate in the blended care pirate group and are asked to participate in the study as well. Intervention: The total duration of one blended care pirate group is eight weeks with two times three hour training sessions at the rehabilitation centre and additional training sessions at home. The training sessions on-site will be the same as the conventional pirate group. For the training sessions at home parents will receive instructions and material from the therapists. This intervention is developed and already planned by therapists without direct influence of the research department and can therefore be considered as standard treatment. Main study parameters/endpoints: The primary outcome are the total training hours performed by parents at home. Additionally after the blended care pirate group parents and therapists will participate in an interview about how they perceived the blended care pirate group. Secondary outcomes are improvements in arm function during the blended care pirate group.