DD is 10, DS is 7. Me and my spouse are their natural parents, no marital or relationship issues. When I look after the kids on my own they are great. When my other half looks after them they are also great. When either set of grandparents look after them....again they are great. BUT...when me and darling partner are both together they are a pain in the proverbial: fighting, bickering, attention seeking! WHY!?! Would they rather be brought up in single parent house holds?