Is your toddler/preschooler learning any bad behaviors or habits from older siblings?

I've caught my 4 year old talking in a snotty tone that I'm trying to break her sister from using.

oh we have this as well the age gap does not help from 7 to 4 yrs old... my younger son will start to argue wich he never used to(older ds started that towards the end of the school year).. we have worked hard this summer to nip it in the bud but man it gets old...