Not a single thing wrong about mentioning your kids. I have been a mother to a small pup myself and have blogged proudly about it. Because I am proud of her, She has grown up awesomely and does awesome things which I feel sharing with people. You must be too (proud of your children) and hence blogged about it. Not a single thing wrong about it and that does not make anyone a bad human being.
Don't take hate mails too seriously. Hate mails (Esp anonymous) are signs of weakness themselves. You need to concentrate on a new contest that may come up now :)
I love both my kids equally. I blog a lot about my son, recently there have been many posts of him. I miss him a lot. This is the first time he has been away from home, but somehow it is my daughter who gets noticed. Weird people with weird thoughts
. Thanks for the support.