Ha ha ha...
SIL was NEVER going to shout / get cross / discipline (harshly) her children.
She was also going to cloth nappy / BF for ever and hand make everything....
THEN she became a parent...how DH and I have larfed at her and her DH 'coping' (or not) with the transition - they basically moved into the PILs house and are there nearly every w/end as the PILs look after their DCs...tee hee hee. OK, we were already parents and had accepted how useless we were/are...
Oh and there are still those moments - we were weaning at the same time and I was feeding DC at the table.
SIL was telling me all about the wonderful home made dinners she ALWAYS cooked for PFB (also weaning)...
Meanwhile I was smiling serenly and spooning a well known branded jar into my DCs mouth, nodding sagely and basking in her magnificence (yawn, oh you're such a better mummy than I am with my commercial baby food) trying to make the point 'isn't it lucky we all do it differently...'when she turned and stated down the kitchen - 'I really can't STAND X brand of baby food, who would do that to their child?' in her best yummy mummy voice....
Oh yes, it was X brand on the jar. ROFL. The subtlety.
BUT, I did cloth nappy to toilet training and BF for 2 years, plus MY knitting actually looks like stuff, not just a heap of yarn, ha ha ha, so I feel a sense of smug when these events occur 
We are all talented in different and equally important areas of parenting. ie we know our own selves, circumstances and kids and do the very best that we can at any given time...
Now - what about competative poverty...