The thing was that Alvin said something as Ayu being his sister/mom (don't remember correctly) and then the reporter joked about all of them being a family Tyson x Ayu x Alvin, and then the reporter asked Tyson if he was enjoying Hong Kong or something like that and he said it would be better if he had time alone with Ayumi, and not the "family".
But there's also rumors about Alvin hitting on Tyson and Ayu being mad about it.
By the way I searched for his name on the internet and found this video of him doing a tattoo on the leg on his underwear lol:
I assume Ayu must had fun lol