Columnist and trained counsellor Fiona Caine answers another set of dilemmas

My five-year-old daughter was a relatively well behaved and easy-going child, right up until her baby brother arrived last year. Now she’s a nightmare and most of her acting out is directed at her little brother. She gets angry and aggressive towards him. Last week, I left them alone for just a few moments and found her trying to force the TV remote down his throat. I screamed at her and, to my shame, actually smacked her. All this did was give me two upset children rather than one. My children deserve better and I feel terrible for what I did. But what can I do?