In my opinion, a mix the first two would be ideal. Your personal side will show your authenticity around parenting & family and show you have other interests, you can post occasional links to the blog of posts you would like to promote or that are doing well. Finally, for occasional posts, that frequent retweet you AND other competitors/brands with positive messages and information should come from a separate business twitter account. Hope this helps or at least gets you thinking. I'm happy to provide any additional info via a followup call.