Ateez - remarried

This is just a random thought while im camping. So Seonghwa is a now single father of Wooyoung..who is 5. he and his now ex husband since long, divorced because the husband cheated bit confusing but let's name the guy Xavier. so Xavier cheated on Seonghwa and had kids with another person.. . A few years later Seonghwa tells Wooyoung that he has met a guy. Hongjoong he was very rich lived in a big house and worked as a music producer and so on, They had gone on a few dates and now fell inlove so Hongjoong told Seonghwa to move in and Wooyoung of course. Hongjoong had 5 Boys already.... . Yunho his oldest is 17, Then Yeosang who's 15, San and Mingi Twins who are 12 and Jongho who is 10. . Wooyoung was going from living with Appa alone to having 2 appas and 5 older brothers...how does he react?