I attempt to be a consistent parent (and fail!) but I am really struggling with PIL complete change of personality when my DH's sister and family are around.
In general, Granny is very indulgent of my DC and whenever I ask them not to do something it is met with 'ach, they're fine...just exploring/that's what DH did as a child/I love the way they enjoy doing that'...so far so good.
When SIL and family are around, they are positively mean to DS1
One recent incident was so horrid I was in tears after we came home, and DS1 was smart enough to say (the next day) that he was only upset because Granny doesn't usually talk to him with a mean voice.
There is history with MIL/SIL and PIL are markedly colder to me when SIL around, but I would be pretty pissed off if DS1 is getting residual mean-ness!
Not sure what responses I want/need - just feels good to get it out there 