Do you feel that you SIL has very obvious Bias towards your other SIL child thn your own child? I feel that way because it is proves in many ways. She never buy things for my child, but always buy things for my SIL child. Nicknamed my child's beautiful name with some thing stupid, but not my SIL child. and so many things..............

To make inner peace with yourself, try not to compare. Your baby will eventually know who is nice to them and who is not. Most importantly your baby is well loved by mummy and daddy.

Try to ignore. No point feel angry or upset over such bias attitude for the kids. kids are young they don't know. Kids feed on our feeling. ignorance is bliss.

I'll ignore and don't care. If I get affected by it, it does me no good. It won't change the situation either.