Keeping your 'new kids' with you and letting your 6 year old dd from your previous relationship go and stay with gran (ex dh's mum) for 4 or 5 nights a week.
Having a wardrobe full of new clothes and clearly spending a lot on your hair extensions/fake tans/nails when your two kids look like urchins and go all winter without a warm enough coat each.
Going on 4 or 5 holidays a year with your oh whilst the kids have no holiday at all.
All real examples of people I know, all shit parents IMO.