Do kids pick up habits from other kids? My daughter has a regular play date with 2 boys in my condo and they are always pushing and biting, and throwing tantrums. Will my daughter pick this up, or is she more likely to behave based on how she's brought up at home?

Yeah kids do get influenced by their peers, who are in turn influenced by what goes on at home as well. I believe that nipping it in the bud is the best solution. One valuable piece of parenting advice that I've been given is that when reprimanding your child for doing something wrong, be sure to tell them why it's wrong, and what's a right alternative as well.