My ds has dealt with this shit most of his life.
His father (my ex h) has 5 siblings, all had children around the same time we had ds.
We split when ds was 4, ds went to state school - ex h parents pay for all their other grandchildren to go to prestigious private schools, as they did thier own children, but they hated me so didn’t pay for ds.
Not that I cared actually, never said a word, they can spend their money how they wish and I didn’t want my ds schooling dictated to me anyway.
All cousins are now teens. All in or going to Oxford/Cambridge other prestigious unis.
Ds did okay at school, but decided to do a BTEC and is 19 now and is training to be a paramedic.
He gets a sneered at by his father and his fathers family and it does hurt him. Oh, and obviously it’s all my fault - I’m thick and ds is thick like me/has been dragged up by me and now dh blah blah blah - it’s all a stick to carry on beating me with.
All untrue and pathetic but hey, if it makes them feel good to slag off a person they haven’t clapped eyes on in 15 years, then they can crack on! I must live a happier life than them. My son is wonderful, happy, an amazing big brother to his little siblings and is doing something he cares about in life.
He realised a few years ago that despite the thousands spent on education, his cousins are cunts and all the expensive education in the world doesn’t buy you compassion or class.