He says one day he went to his father's office and heard a discussion between his father and his aunt (his mother's younger sister). His father wanted to end the relationship they had. From that day he knew he might had some chances of making his fantasy come true, he lost the respect for her aunt and he knew that being family was no obstacle for his aunt. It took some time and special attention trying to fix her broken heart but finally she gave in and he said it was worth every second as you can see in the video.