I know exactly how you feel, having been there many times myself but I have learnt to rationalise. I know my DS and DiL love me. I know my DGC love me so what else is there really. It is very rare to love one person more than another even if they provide better presents or give more attention.
Sorry have wandered a little off piste but just to say I sympathise but I am sure both your DD and DGD love the sleep suit you made. (Maybe they are saving it for best!)
34 year old assisted euthanasia