I was hoping to babysit my brother's child and critique his parenting.
Are you saying that you feel your brother is doing a bad job at parenting.
Yeah and I think I could do better.
It's inappropriate to tell your brother how he should be raising his child. You should keep that to yourself unless your brother specifically asks for advice.
You don't know anything. He's a bad parent, if I want to make him look bad in front of his new girl friend then I should be able to. I'll post pictures to prove that he's a bad parent.
Well he may receive the tips better if you give them in a more constructive way. Critiquing is only going to make him upset and feel like you are attacking him. Just try to go off what has worked for you and see if any of it would be something he may want to try.