I genuinely want to know if I'm wrong here... at Easter, I had covid and so when BIL and SIL came over it was as case of DH having to meet them with DS in park. DS is 9 and nephew is 3. As I understand it, DS played with cousin (nephew) for a bit and then saw a friend from football in the park and ask dad if he could go off and play. DH said yes and DH then played with 3 year old for a bit. DH told me after the SIL got the hump that DS wasn't playing with his cousin. Now, months later, MIL tells me that SIL mentioned it to her. I think SIL is being ridiculous. Of course my 9 year old son isn't interested in playing any length of time with a 3 year old.
That's totally normal. He wasn't unkind in any way just saw children his own age. I think this is SIL having PFB syndrome. Am I wrong?