My friend has 3 kids, the youngest 2 girls are adopted aged 10 and 8. The 10 year old is treated differently to the 8 year old. The 10 year old is denied attention and affection being seen as a difficult and awkward little girl unlike her little sister (the sun shines out of her A#$E) Both have difficult backgrounds as is the usual with adopted children. Parents aren't stupid by any means, these are good people. I have pointed out the dangers of treating them so differently but it is like water off a ducks back. Their eldest, who is their biological son, is in his teens and seems happy, although has his own life so not like I see him regularly. AIBU to withdraw contact, I have confronted them more than once but in a kind and understanding way. What is making the situation worse is I am being triggered by the situation because of my own childhood trauma- this may be clouding my judgement a bit.