Hi LivyLove - if these feelings begin to overwhelm you and start affecting your ability to function i would seek out a therapist to help you work through the self esteem issues. What is it in particular you are jealous of? Do you think that if you were on a level playing field with your sister in law you would only find other things or other people to be envious of? I think we're conditioned to always want more and never quite feel satisfied. Perhaps every time you find yourself comparing yourself to your SIL you could be mindful of those thoughts and try to turn them into positive statements i.e. my baby isn't dressed as nice - to - my baby is also dressed nice. It may sound obvious but sometimes just reframing the situation can help take the sting out of jealousy and reassure us that we too have good things/qualities that others would be envious of. Im sorry if i haven't been very helpful but maybe a more drastic shift in focus would help - could you do voluntary work or give back to your local community more? I hope these feelings improve for you - all the best.