Finding out he had an older half-sister named Holly was a shock to Josuke. You could only imagine his reaction when finding out about your existence.
You were another child of Josuke's father, Joesph Joestar he had with another, another women. As much as this revelation ticked Josuke off about how his father was an unloyal partner. He still cared for the old man.
Even then, Josuke held nothing against you. Instead, he focused on trying to meet you. So, with the help of his mother, they would get in contact with your mother and explain the situation to her.
It was awkward for Josuke having to explain to your mother that she was infact wasn't Joesph first or even second wife..... He had to practically hold the phone away from his ear after hearing your mother outrage, none targeted to his mother or himself, much to his relief.
So once they had everything sorted out, they planned on a day you would meet up. And when that day came, Josuke and his mother Tomoko arrived at your house.
Knocking on the front door, where they would be greeted by your mother warmly, as Josuke greeted her warmly, trying to be well-mannered.
"Hello, Ms. Sato! It is so good to see you! It is a pleasure to finally meet you."
At the same time, Josuke tried to get a small look inside to see if he would catch a small glimpse of his younger half-sibling roaming around the house.