Situations with the in-laws are always touchy. Pretty sure all our families have their weird quirks 1 way or another we deal with. I tend to tread lightly when it comes to stuff with my wife's family and if it's that big of a deal I address it with her to try and talk some sense into whatever it is going on with her side of the family. Especially when my FIL was still alive, he was the last one you'd want to piss off and being I am married to his youngest I'm the "newest" to the family too so whenever any other spouses did something to irk him I kinda smiled inside that it wasn't me.
Kind of on topic here about in-laws and what is appropriate. It's a fine line trying to raise your kids and not have either of your parents over-step their boundaries once in awhile telling you what they think you should do without you soliciting their advice. I run into it with my own parents that have irritated my wife and even me from time to time that I've had to deal with. I remember a tense moment once when we were going through various sicknesses with the kids when they were daycare age when my FIL just blurts out in front of the whole family "your kids are always sick, maybe it's your daycare that's the problem." I didn't really get offended by it but my wife was not happy and snapped back at him on as we both knew that daycare centers are basically a petri dish for viruses but in the long run also good for building immunity too. Just little stuff like that I'm pretty calculated about when to just say nothing and when to find a way to bring it up later in a less confrontational manner.
Kind of on topic here about in-laws and what is appropriate. It's a fine line trying to raise your kids and not have either of your parents over-step their boundaries once in awhile telling you what they think you should do without you soliciting their advice. I run into it with my own parents that have irritated my wife and even me from time to time that I've had to deal with. I remember a tense moment once when we were going through various sicknesses with the kids when they were daycare age when my FIL just blurts out in front of the whole family "your kids are always sick, maybe it's your daycare that's the problem." I didn't really get offended by it but my wife was not happy and snapped back at him on as we both knew that daycare centers are basically a petri dish for viruses but in the long run also good for building immunity too. Just little stuff like that I'm pretty calculated about when to just say nothing and when to find a way to bring it up later in a less confrontational manner.