Yeah , from the research I ' ve done , air leaks defeat any amout of insulation . <| sep |> You won ' t change her if she ' s been like this for a long time . But you can make her stop saying these things in front of you better than why do you do this ? something more assertive has better results , like Stop saying this right now or I ' ll go away . Next time you do this I hang upgo away . But as you said she kind of stopped doing it with you so maybe you could coach you sister to respond to her the way you do ? Best case scenario she finally gets what she ' s doing wrong and stops , worst one she at least stops pestering your sister . <| sep |> It ' s worked for me over the years and it ' s only used when you can ' t meet .