Here’s a refined version of your message:
"I want to talk about something important, and I hope you can hear me out without taking offense. I’m not looking for a confrontation, and I would appreciate it if we could keep this conversation calm. As you know, I have strong feelings about my family members, and I struggle to understand Khutso. While I genuinely want to build a proper family and repair our relationship, I feel uncomfortable with you having Khutso’s number. Last time you were here, I was told that I don't really know how to maintain a relationship. I believe it's fine for you to have Mpho's number, but not Khutso's. Thank you for considering my perspective."