Being a parent. (Children optional.) (I mean, seriously, if it were about children the term would mention children.) (But it's "parenting," which means it's all about me, the parent, and the child, if any, is merely an accessory, like my handbag or my iPhone.) (Only more expensive.)
My mother and father all but killed themselves raising my brothers and sisters and me. I'm so glad my generation invented parenting instead.