I have 2 SILs who both have dc 10ish years younger than ours (they both met their DHs when they were in their late 30s). Younger SIL is great - very realistic and not show offy about dcs behaviour, we are mutually happy about good things that happen in each others lives and we just have a good healthy relationship and look forward to seeing each other. Other older SIL is incredibly smug about everything and always pointing out how well behaved and laid back her dc are (though EVERY TIME we see them they are moany and unkind to other SILs small dc but this is always justified by older SIL with some excuse). She frequently likes to point out that they eat everything and makes many references to this and lots of posts on Facebook of them eating some unusual food. My youngest dd is a fussy eater and she relishes this at get togethers which makes it uncomfortable. When we do something or buy something she has a better one and says so in a very patronising way. It is not just me who is irritated by her. DH and other SIL and her DH find her even worse than us. I'd love to not be wound up by her. She has such an air of superiority about her I'd love to put her down a peg or two and would have nothing to do with her if we weren't related. How would you deal with her?