I am talking about one DC in particular who is a very longstanding friend of my DC and I am a close friend of her DM. Both of our children are 8. My friends DC is very challenging and this situation has been going on for a very long time but has come to a head in recent weeks.
My DC had a small birthday party a week ago. Friends DC totally dominated the party with constant whining, demanding and tantrumming. Complaining if others won games and then when she won throwing her prize across the room and declaring it "rubbish".
Not wanting to get cross at my DCs party I took other DC aside and talked to her calmly and firmly about her behaviour but it continued. When her other parent arrived (I'm less close to this parent than the DCs mum) the horrible behaviour continued now witnessed by her parent and parent sighed and almost laughed.
When they left my DC was really upset about the friends behaviour and said it had ruined the party, it kind of had. I felt like calling my friend and telling her but I couldn't bring myself to...feel so gutless about this. This is not the first time this DCs behaviour has spoiled events and I am getting really, really fed up with it but I am also fed up with my inability to approach my friend about it.
Is there any "good" way to approach this subject without a huge falling out?