i have sympathyfor you! i lived my parents with my DH and DD from the time she was 5 months till 20 months and the way my parents tried to involve themselves in the way i disciplined DD use to drive me crazy! i believe what you are doing is fine and also like someone else said 'distraction distraction distraction'! stick to your guns about discipling your little one and i use to make it very clear that i was her parent and that when me or DH were there they were not to interrupt whether they agreed or disagreed with what i was doing. it used to make the situation so much worse and DD would then play me off against them. We did have one huge arguement over this but at the end of the day i just had to make it clear that i did not want to hear their opinion on it because it was completely opposite to my parenting beliefs. good luck and keep remembering there is light at the end of the tunnel if you are getting your own place! once you move its like it never happened!